The Effect of Portfolio Assessment on Iranian EFL Learners’ Autonomy and Writing Skills

,e portfolio assessment is a purposeful and systematic collection of students’ work that is intended to show progress over time. ,e researchers employed the Oxford quick placement test, autonomy questionnaire, and topic-based paragraph writings as the pretest and posttest. ,e design of the study was quasiexperimental. To this end, researchers chose 120 learners with the convenience sampling method, which were 60 learners at the upper-intermediate and 60 learners at the advanced level. Participants were divided into two homogeneous groups (30 learners) such that there were two groups at the upper-intermediate level and two groups at an advanced level as experimental and control groups. A piloted writing pretest was given to both groups before the treatment. ,e experimental group had received the treatment of four writing tasks to perform. In order to address the research questions, descriptive statistics and covariant analysis were used. Based on the results achieved from the first research question, portfolio assessment has a positive significant effect on Iranian EFL learners’ autonomy on both upper-intermediate and advanced levels. ,e results also indicated that portfolio assessment has a positive significant effect on Iranian EFL learners’ writing skills on both upper-intermediate and advanced levels.


Introduction
A study into the history of language teaching and pedagogy suggests that there has been a close interrelationship between language teaching and assessment. Writing skill is the most neglected area in language learning [1,2]. It seems to have more agreement that speaking and listening are the skills most needed when trying to succeed in a foreign language environment [3]. Writing is an ongoing process that needs much practice and attention [4]. Many EFL learners such as Iranian EFL students have problems in developing their writing ability in general and their descriptive writing ability in particular [5,6]. For many years, portfolio assessment has been been one of the most relevant methods for EFLT because of its massive efficiency in the learning process. One of the process-based evaluation techniques is certainly portfolios [7]. e constructivist approach is presented on the basis of portfolio studies because the student needs construction in his/her mind for each study and activity to be placed in the portfolio [8]. He/she reflects his/her learning to his/her studies. From this perspective, it can be said that portfolio application contributes to constructivist learning theory [9]. In the process of compiling a portfolio, a constructive form emerges in the student's mind that he or she can summarize without the teacher's help what he or she has learned, what he or she has not mastered, and what he or she has learned during the certain period. In this way, students can learn self-evaluation correctly [10]. e complexity of factors involved in effective writing would presume that a substantial amount of time is dedicated to writing in language programs. Nonetheless, according to Aini, Mufid, and Sari [11,12]; Nunan [13]; and White and Arndt [14], it has tended to be a muchneglected part of the language program, despite the power of writing as a permanent record, as a form of expression, and as a means of communication.
Learner autonomy has been a crucial concept in the field of language learning for the last three decades. is has been the result of development due to the development of classroom-based approaches in education [15,16].
In order to enhance learners' writing skill and autonomy, as the two communicative and pedagogical elements in language learning, various approaches are presented to provide the learners with an environment in which they can practice and learn the language and experience different contexts [8,[17][18][19][20]. e idea underlying learner autonomy is based on the philosophy that if the students are encouraged toward decision making, goal setting, and reflecting in their process of learning, they, eventually, become more enthusiastic and purposeful about their learning and, consequently, learning can be more enjoyable, focused, and fruitful to them [21,22]. e aim of this research was to investigate the effect of portfolio assessment on Iranian EFL learners' autonomy and writing skills in upper-intermediate and advanced levels. e Concept of Portfolio. Portfolio assessment has been used as an alternative approach to standardized testing for more than two decades. It commonly refers to a print or web-based dossier, where students regularly revisit and evaluate their learning trajectories by way of multimodal artifacts [7]. Portfolio assessment in education aims to equip learners with self-reflective capacity so that they are able to monitor, review, and improve their academic performances independent of the teacher's instructed guidance [9,[23][24][25][26].
Moreover, Virgin and Bharati [27] believe that a portfolio should express the students' efforts and attainment and teachers' thought of portfolio assessment as an educational tool, teachers' and students' role in portfolio development, and teachers' belief of portfolio strengths and weaknesses are crucial. e portfolio assessment becomes an attractive alternative way of increasing students' writing skills. A portfolio plays an important role in improving students' writing skills. It is an effective instructional technique as well as an assessment tool that can provide evidence of knowledge and skills [28]. Furthermore, portfolio assessment can offer authentic information about the progress of students and can be used as a means of assisting students to overcome their writing anxiety in foreign or second-language learning [29][30][31][32][33].

Writing Skill.
e common view that writing skill in a foreign language is difficult to acquire may lead to loss of motivation and, therefore, lack of success among English as a Foreign Language (EFL) learners [34]. Portfolio application as an alternative method in foreign language teaching may alleviate such a problem and appear as an effective means to increase students' motivation and success levels in EFL writing classes. Its application, therefore, needs to be disseminated for teaching English in the EFL learners [35,36].
In writing, the writer needs to express the idea in the mind to the paper or any other kinds of writing tool which is readable. Writing is a complex activity involving many skills to determine the ideas and transfer the ideas onto a piece of paper clearly and comprehensibly for the reader [36][37][38][39]. e application of portfolio assessment in academic writing has been proved as an impetus to writing practice. Results show the feasibility of the portfolio assessment and indicate the improvement in confidence, involvement, selfassessment awareness, and overall learner identity formation.
e findings have pedagogical implications that portfolio-based classroom is successful as the driving force of learning and in addressing the private college students' learning difficulties vis-a-vis EAP writing task [10,35,40,41].

Autonomy.
For the first time, the phrase was contrived in 1981 by Henri Holec, titled the father of learner autonomy. Since then, many depictions and explanations have been created for the term. Contingent upon the author, background, and debate level that tutors have reached was imagined as an individual human feature or a political pattern or an educational maneuver. Autonomy is seen as a goal or instrument or sometimes both in education [15,21].
In the last twenty years, the concept of learner autonomy has become influential as a goal in many parts of the world [42][43][44]. Several arguments may be used in favor of developing autonomy in language learners that autonomous learning is more effective than other approaches to learning and that the learner needs to take charge of his own learning especially outside the classroom [45]. e notion of autonomy in learning has been part of educational philosophy and has recently been identified in educational policy as crucial to the development of lifelong learning in the learning society [46]. Some researchers believe that the ultimate aim of education is for the individual to develop the autonomy of thought to create new, original ideas rather than just recycle old ones. Little [47] also claims that all genuinely successful learning is in the end autonomous.
Using portfolio assessment, students were motivated to be self-assessors of their own development in writing. ey also focus not only on their previous ability or performance but also set goals to improve their writing competence. It means that the students became more aware of the importance of self-reflection and autonomy learning through self-evaluation activities during completing their portfolio assessment [7]. Furthermore, the students understand well what criteria were used to evaluate their work, and they will also understand what the lecturer expected from them so that their writing competence can improve. erefore, by using portfolio assessment, it was proved that engaging students directly in the assessment process will help students to learn writing autonomously [48]. groups as treatment and control groups and 60 learners in the advanced levels divided into two groups as treatment and control groups. In order to ensure that the participants of both experimental groups had the same characteristics in terms of writing and autonomy, all participants were asked to fill an autonomy questionnaire and participate in a writing test prior to the treatment.

Instruments.
In order to investigate the effect of portfolio assessment on learners' autonomy and writing, the researchers employed the following instruments: the Oxford quick placement test, autonomy questionnaire, topic-based paragraph writings as the pretest and posttest, and writing rubric score. Oxford quick placement test : to elicit the information about the learners' proficiency in the English language and to get the homogeneous group, the Oxford quick placement test (2007) was used.
Autonomy questionnaire: an autonomy questionnaire designed by Spratt, Humphreys, and Chan (2002, pp. 265-266) was used as a pretest and posttest in the present study. e questionnaire consisted of four sections with a total of 52 items and was based on a Likert scale. e questionnaire was validated by professors at Islamic Azad University, and the validated version was used in a study by Fahim and Behdani [49]. e students were given 20 minutes to respond to the autonomy questionnaire. e scoring of the first section ranged from 1 (not at all) to 5 (completely), the second section ranged from 1 (very poor) to 5 (very good), the third section ranged from 5 to 1, respectively, to the 1,2,3,4, and 5 choices, and then, the last section's scores ranged from 1 (never) to 4 (often). Consequently, the results could vary from 52-233. e higher the mark the students obtained, the more autonomous they were.
Topic-based paragraph writings as the pretest and posttest: five TOEFL argumentative (agree or disagree) writing topics were taken from the Internet. One of the topics was chosen by the researchers to be used as the pretest and posttest. Four other topics were chosen to be given to the learners during the course to write about.
Writing rubric score: the writings of the participants were evaluated based on the criteria developed by Wang and Liao [50] which can be applied to any type of writing. is rubric has six sections including purpose statement, sense of audience, organization and development, support for ideas, understanding of topic, and use of grammar. e total marks could be from 0 to 24 at most for each person.

Procedure and Data Collection.
In order to collect appropriate data for this study, the following steps were taken: first of all, learners had participated in the Oxford quick placement test. After dividing learners into upper-intermediate and advanced groups, they were asked to fill the autonomy questionnaire. By the result of the autonomy questionnaire, learners were divided into two homogeneous groups. In the first session, they were asked to write a paragraph of at least 150 words in 30 minutes on the subject of "Do you agree or disagree with the following statement? "When people succeed, it is entirely because of hard work. Luck has nothing to do with their success. Use specific reasons and examples to explain your position." e topic was given to them as the pretest. During paragraph writing, they were allowed to use a dictionary or to ask the teacher questions if they did not know a word. Two raters, the researcher and his master, scored the paragraphs based on the writing rubric score.
During the treatment, the learners were assigned four topics to write a paragraph of at least 150 words for each subject. Each group went through different treatments which will be explained below. After the treatment, learners were given the same topic that was used as the pretest which functioned as the posttest.

Research Questions.
(1) Question 1: does portfolio assessment have a positive effect on Iranian learners' autonomy? (2) Question 2: does portfolio assessment have a positive effect on Iranian learners' writing skill?

Null Hypotheses
Hypothesis 1. Portfolio assessment has a positive effect on Iranian learners' autonomy.

Hypothesis 2.
Portfolio assessment has a positive effect on Iranian learners' writing skill.

Research
Design. e design of the study was quasiexperimental, with control and experimental groups having a pretest and posttest. e independent variable was the implementation of portfolio assessment, and the dependent variables were descriptive writing and autonomy. e descriptive writing was measured through a pretest and a posttest. e experimental and control groups also received the same learning content. About autonomy, again, the researchers had given the same questionnaire to experimental and control groups at the end of the last session.

Experimental Group: Portfolios.
In the next session after the pretest, the teacher explained to the learners how they were going to collect the four writings in a folder during the course.
e "Portfolio Assessment for the Teaching and Learning of Writing" by Ricky Lam [24] was used as a guide book, and the teacher tried to teach chapters 3 to 5 during the sessions.
It was mentioned that the topics were related to the learners' book; thus, after teaching the ordinary material of the book, the teacher gave the chosen topic to the learners and they were asked to write about it in the classroom. ey Education Research International were asked to write the paragraph in 30 minutes and to manage their time.
To increase student's autonomy, they participated in the classroom. ey were divided into four groups, and in each session, one group had to present a given part of the book to other learners and teachers at the beginning of the classroom. Moreover, learners were free to participate actively during the class and the teacher asked them some questions.
At the end of the class, all essays were collected and scored by the teacher and given back to the learners' next session. ey were also given a folder to write their names on it and to keep their writings and checklists there and deliver them to the teacher in the last session. e treatment in this group went on like this for the whole semester until the learners had written on all four topics.

Control
Group: e Traditional Approach. In the control group, the teacher assigned the learners a topic to write about it in the class. e teacher scored the writings and gave the papers back to the learners. is is the method usually used in institutes, schools, and universities in Iran as observed by the researchers. e control group did not have the book, and after some lessons that the teacher gave them for writing about topic sentences, supporting sentences, coherence, and unity, they received conventional writing instruction. en, the teacher gave the same topic to the experimental group to write at least 150 words about it in the classroom in 30 minutes. Afterwards, the teacher collected essays, scored them at home, and gave the scored papers back to the learners in the next session. It should be mentioned that the teacher did not give any feedback to the learners except the score. e learners in this group wrote on all four topics and received scores for their writings during the semester.

Data Analysis.
Following the objectives of the study, the data collection was carefully performed and the raw data were entered into SPSS (version 22) to run the required statistical analyses and respond to the research questions of this study.
In this research, descriptive and inferential statistical methods were used to analyze the collected data and test the hypotheses. In descriptive methods, an attempt was made to describe the research data by presenting tables and using descriptive statistical tools such as central indicators and dispersion, in order to contribute to the clarity of the subject. Researchers also used inferential statistical methods to test hypotheses.
In the inferential analysis section, researchers first test the hypothesis of normality using the Kolmogorov-Smirnov test. Afterwards, the analysis of covariance and T-test were used to test findings. Covariance analysis is a comprehensive type of analysis of variance in which, while comparing the means of one or more groups and estimating one or more independent variables, the effect of one or more intervening, covariate, or covariate variables is excluded from the equation. In other words, covariance analysis is a statistical method that allows the effect of one independent variable on the dependent variable to be examined while eliminating the effect of another variable.

Results
We As can be seen in Table 1, the average of an autonomy variable in the upper-intermediate control group in the pretest is 130.86 and in the posttest is 132.50. Also, the average autonomy variable in the experimental upper-intermediate group in the pretest is 130.83 and the posttest is 166.86. It should be noted that the increase in the mean of the autonomy variable in the posttest stage was higher than that in the pretest in the experimental group compared to the control group.
To test this hypothesis, an independent-and pairedsample t-test were used. To perform these tests, it is necessary to use the Kolmogorov-Smirnov test for checking the normality distribution of the whole data in both pretest and posttest of autonomy and writing tests.
erefore, researchers first examined the assumption of using both the pretest and posttest. e results of the abovementioned test are given in Table 2.
According to the significant values that are shown in Table 2, which are higher than 0.05, the null hypothesis of normality of the discussed variables is accepted at a significant level of 0.05.
Due to the normality of the samples of the study, an independent-and paired-sample t-test were used to test the first hypothesis. e results of the independent-sample test for the test of comparing the mean of an autonomy variable in the pretest stage between the control group and the experimental group and also in the posttest stage between the control group and the experimental group are given in Tables 3 and 4. As can be seen, in the pretest stage, the average of the autonomy variable in the control group was 130.86 and in the experimental group was 130.83. e results of the independent samples test at 5% error level showed (Sig � 0.997) that there is no significant difference between the mean of autonomy variable in the control group and the experimental group in the pretest stage. Also, in the posttest stage, the average autonomy variable in the control group was 132.50 and in the experimental group was 166.86, and the results of the independent samples test showed an error level of 5% (sig � 0.000).
ere is a significant difference between the mean of the autonomy variable in the control group and the experimental group in the posttest stage.
e results of paired-sample test for the test comparing the mean of autonomy variable in the control group in two stages of the pretest and posttest and also comparing the mean of autonomy variable in the experimental group in two stages of the pretest and posttest are given in Table 5.
As can be seen from Table 5, there is no significant difference between the means of the autonomy variable in the pretest and posttest stages in the control group (sig � 0.159), but in the control group, there is a significant difference between the mean of autonomy variable in the pretest and posttest (Sig � 0.00). erefore, it can be concluded that, in the experimental group, the mean of the autonomy variable in the posttest significantly increased relatively to the pretest.
We conducted a test of the first research question in the advanced group, "Does portfolio assessment have a positive effect on Iranian upper-intermediate learners' autonomy?" Descriptive indices of autonomy variable scores in the pretest and posttest in advanced-level control and experimental groups that are recorded in Table 6.
As can be seen in Table 6, the average of the autonomy variable in the advanced control group in the pretest is 165.56 and the posttest is 166. 16. Also, the average autonomy variable in the advanced experimental group in the pretest is 165.50 and in the posttest is 201.76. It should be noted that the increase in the mean of the autonomy variable in the posttest was more than that in the pretest in the advanced experimental group compared to the control group. To test this hypothesis, independent-and paired-sample t-test were used. To use these tests, it is necessary to use the Kolmogorov-Smirnov test for checking the normality distribution of the whole data in both the pretest and posttest of autonomy and writing tests.
erefore, researchers first examined the assumption of using both the pretest and posttest.

Scores Normality.
In this study, the Kolmogorov-Smirnov test was used to investigate the hypothesis of normality of independent variable scores. e results of the abovementioned test are given in Table 7.
Given the values of sig in Table 7, all of which are higher than 0.05, the null hypothesis means that the variables in question are normal at the significance level of 0.05. e results of the independent-sample test for the test of comparing the mean of an autonomy variable in the pretest stage between the control group and the experimental group and also in the posttest stage between the control group and the experimental group are given in Tables 8 and 9.
As can be seen in the pretest stage, the average of the autonomy variable in the control group was 165.56 and in the experimental group was 165.50. Also, the results of the independent-sample test at 5% error level showed (sig � 0.989) that there is no significant difference between the mean of the autonomy variable in the control group and the experimental groups in the pretest stage. Furthermore, in the posttest stage, the mean of the autonomy variable was 166.16 in the control group and 201.76 in the experimental group. Besides, the results of the independent-sample test at 5% error level showed (sig � 0.00) that there is a significant difference between the mean of autonomy variable in the control group and the experimental group in the posttest stage.
e results of the paired-sample test for the test comparing the mean of the autonomy variable in the control group in two stages of pretest and posttest and besides comparing the mean of the autonomy variable in the experimental group in two stages of pretest and posttest are given in Table 10.
As can be seen from Table 10, in the control group, there is no significant difference between the mean of the autonomy variable in the pretest and posttest (Sig � 0.452), but in the control group, there is a significant difference between the mean of autonomy in the pretest and posttest (sig � 0.000). erefore, it can be concluded that, in the experimental group, the mean of the autonomy variable in the posttest significantly increased comparatively to the pretest.
We conducted a test of the second research question, "Does portfolio assessment have a positive effect on Iranian learners' writing skill?"

Choosing Topics to Use in Writing Portfolio Effect.
To select topics to use in the writing section, researchers focused on TOEFL writing subjects because the TOEFL test is a highquality standard to evaluate and teach students and it is preferred and accepted by universities worldwide.  Additionally, researchers used the Lawshe CVR Content Validity Formula and interrater reliability between the two raters to check TOEFL question subjects' validity again in this research.

Topic-Based Paragraph Writings as the Pretest and
Posttest. Among sixty TOEFL argumentative (agree or disagree) writing topics and by using Lawshe CVR (content validity ratio) and CVI (content validity index) (0.42, 0.79), five TOEFL argumentative (agree or disagree) writing topics were chosen. By using Lawshe CVR and CVI, five TOEFL argumentative (agree or disagree) writing topics were selected among sixty subjects. e first topic was chosen by researchers to be used as the pretest and posttest. Four other topics were chosen to be given to the learners during the course to write about.

Interrater Reliability between the Two Raters.
Interrater reliability is the extent to which two or more raters (or observers, coders, and examiners) agree. It addresses the issue of the consistency of the implementation of a rating system. Interrater reliability can be evaluated by using a number of

Interrater Reliability between the Two Raters in Upper-
Intermediate Groups. Before testing the second hypothesis about the effect of portfolio assessment on Iranian EFL learners' writing skills, descriptive indicators related to the scores given by the two referees in upper-intermediate control and experiment groups for the pretest and posttest and the correlation coefficient between the scores of these two referees were calculated. As can be seen in Table 11, in both upper-intermediate control and experimental groups, pretest and posttest, the Pearson correlation coefficient between the scores of the two referees is significant at an error level of 5%.

Interrater Reliability between the Two Raters in Advanced
Groups. Before testing the second hypothesis about the effect of portfolio assessment on Iranian EFL learners' writing skills, descriptive indicators related to the scores given by the two referees in advanced control and experimental groups for pretest and posttest and the correlation coefficient between the scores of these two referees were calculated and are shown in Table 12.
We conducted a test of the second research question in the upper-intermediate groups, "Does portfolio assessment have a positive effect on Iranian learners' writing skill?
Descriptive indices of variable scores of writing skill in control, upper-intermediate, and advanced groups in the pretest and posttest are listed in Table 13.
As can be seen in Table 13, the mean writing skill score in the control group in the pretest is 14.28 and in the posttest is 14.55. Besides, the mean writing skill score in the experimental group in the pretest is 14.61 and the posttest is 18.78. It is obvious that an increase in the mean writing skill score in the posttest stage is higher than that in the pretest in the experimental group.
To test this hypothesis, independent-and paired-sample t-tests were used. To use these tests, it is necessary to conduct the Kolmogorov-Smirnov test for checking the normality distribution of the whole data in both the pretest and posttest of autonomy and writing tests. erefore, researchers first examined the assumption of using both the pretest and posttest.

Score Normality.
In this study, the Kolmogorov-Smirnov test was used to test the hypothesis of normality of the variables of writing skill. e results of the abovementioned test are given in Table 14.
e values of sig are given in Table 14, all of which are higher than 0.05. e results of the independent-sample test for the test of comparing the average of the writing skill variable in the pretest stage between the control group and the experimental group and also in the posttest stage between the control group and the experimental group are given in Tables 15 and 16.
As can be seen in the pretest stage, the average of the writing skill variable in the control group is 14.28 and in the experimental group was equal to 14.61. e results of independent-sample test at 5% error level showed (sig � 0.59) that there is no significant difference between the mean of the writing skill variable in the control and the experimental groups in the pretest stage. In the posttest stage, the average of the writing skill variable in the control group was 14.55 and in the experimental group was 18.78. e results of independent-sample test at 5% error level showed (sig � 0.00) that there is a significant difference between the mean of the writing skill variable in the control and the experimental groups in the posttest stage. e results of the paired-sample test for comparing the average of the writing skill variable in the control group in the two stages of pretest and posttest and also comparing the average of the writing   skill variable in the experimental group in the two stages of pretest and posttest are shown in Table 17.
As can be seen in Table 17, there is no significant difference between the mean of the writing skill variable in the pretest and posttest stages in the control group (sig � 0.36) but in the control group and there is a significant difference between the mean of the writing skill variable in the pretest and posttest (sig � 0.00). erefore, it can be concluded that, in the experimental group, the average of the writing skill variable in the posttest has significantly increased comparatively to the pretest.
We conducted a test of the second research question in advanced groups, "Does portfolio assessment have a positive effect on Iranian learners' writing skills?".
Descriptive indices of writing variable scores in the pretest and posttest in advanced-level control and experimental groups that are recorded in Table 18.
As can be seen in Table 18, the average writing skill variable in the advanced control group in the pretest stage is 17.68 and in the posttest stage is 17.60. Also, the average variable of writing skill in the experimental advanced group in the pretest stage is 17.70 and in the posttest stage is 21.20. It should be noted that the increase in the mean of the writing skill variable in the posttest stage was higher than that in the pretest in the advanced experimental group compared to the advanced control group.
To test this hypothesis, the independent-and pairedsample t-test were used. To use these tests, it is necessary to conduct the Kolmogorov-Smirnov test for checking the normality distribution of the whole data in both the pretest and posttest of autonomy and writing tests. erefore, researchers first examined the assumption of using both the pretest and posttest.

Score Normality.
In this study, the Kolmogorov-Smirnov test was used to investigate the hypothesis of normality of independent variable scores. e results of the abovementioned test are as given in Table 19.
According to the sig values obtained in Table 19, which are higher than 0.05, the null hypothesis, i.e., the hypothesis of normality of the discussed variables, is accepted at a significance level of 0.05. e results of the independent-sample test for comparing the average of the writing skill variable in the pretest stage between the control and the experimental groups and also in the posttest stage between the control and the experimental groups are given in Tables 20 and 21. As can be seen, in the pretest stage, the average of the writing skill variable in the control group was 17.68 and in the experimental group was 17.70.
e results of the independent-sample test at 5% error level showed (sig � 0.959) that there is no significant difference between the mean of the writing skill variable in the control and the experimental groups in the pretest stage.
Also, in the posttest stage, the average of the writing skill variable was 17.60 in the control group and 21.20 in the experimental group. e results of the independent-sample test was at 5% error level showed (sig � 0.00) that there is a significant difference between the mean of the writing skill variable in the control and the experimental groups in the posttest stage.
e results of paired-sample test for comparing the average of the writing skill variable in the control group in the two stages of pretest and posttest and also comparing the average of the writing skill variable in the experimental group in the two stages of pretest and posttest are shown in Table 22.           As can be seen from Table 22, in the control group, there is no significant difference between the mean of the writing skill variable in the pretest and posttest (Sig � 0.83), but in the control group, there is a significant difference between the mean of the writing skill variable in the pretest and posttest (sig � 0.00). erefore, it can be concluded that, in the experimental group, the average of the writing skill variable in the posttest has significantly increased relatively to the pretest.

Discussion
is study tried to examine the effect of portfolio assessment on the Iranian EFL learners' autonomy and writing skills in upper-intermediate and advanced levels. Considering the fact that few research has been conducted to compare the impact of alternative assessment techniques, especially portfolio assessment on the autonomy and writing skills in Iran as an EFL context, the researchers felt the need for further research.
Writing is basically a complex process covering selecting, combining, and arranging ideas into a good product. Dealing with the complicated process, according to Lundstrom and Baker [61], writing itself has some aspects which have been categorized into two issues, namely, global issues which consisted of content and organization and local issues, such as vocabulary, grammar, and mechanics. Relating to that statement, it was found that, during the treatment, most learners were confused and faced difficulties when writing a recount text with correct grammar.
Due to this problem, it might be caused by some factors, such as the lack of vocabulary knowledge, the unfamiliarity with the activities, different writing styles, and so on. is condition is basically similar to the study of Eridafithri [62] and Karani [63] where most EFL learners got problems in writing because of grammar and vocabulary. us, to overcome the problems encountered by learners when making ineffective writing, teachers can give some feedback on their worksheet by applying portfolio assessment in order to correct their mistakes and enhance their writing ability.
Additionally, a study conducted by Prastikawati, Sophia, and Sodiq [64] find that the mean scores for the five writing aspects of the experimental group got a significant improvement after the treatment. In line with the work of Obeiah and Bataineh [65]; Shokraie and Tabrizi [66]; and Tabatabaei and Assefi [59], learners of the experimental group showed a great improvement in writing ability in terms of content, organization, vocabulary, grammar, and mechanics.
Related to the previous finding, the result of this study showed that using portfolio assessment improved learners' overall writing ability in terms of five important aspects in writing, such as content, organization, vocabulary, grammar, and mechanics. However, the study of Roohani and Taheri [67] shows that portfolio assessment does not affect students' writing ability in terms of vocabulary and mechanics. Also, Uçar and Yazıcı [68] found that there is no significant improvement in portfolio assessment on students' writing ability in terms of mechanics. e improvement score of content in the posttest was in line with the study of Obeiah and Bataineh [65]; Marinho et al. [10]; Prastikawati et al. [64]; and Shokraie and Tabrizi [66], which indicates that the greatest effect of portfolio assessment is on the aspect of the content. Meanwhile, the least improvement of those aspects in this study is grammar and mechanics.
ese research findings indicate that writing should not be seen as an activity to produce a product by neglecting the process to reach the goals. Rather, it should be seen as a recursive process in composing a piece of written text for a certain objective, reader, and language use [65]. Furthermore, the use of portfolio assessment in this essay writing class can be considered as a good strategy to make students become more independent learners and self-confident since they become more aware of their own strengths and weaknesses [40].

e Second Research Question.
e research result shows that the students' autonomous learning was improved after the implementation of portfolio assessment. In this regard, portfolio assessment had a positive impact on the learners' autonomy because the portfolio assessment has the sound application of appropriate tasks which creates a balance between "teaching, learning, and testing" [25] and, on the other hand, boosts the learners' awareness of the process of learning.
According to the researchers' study, research findings are in line with the work of Atai and Nikuinezhad [69]. Learners were satisfied with the portfolio method, and at the end of the study, they had a better understanding of their strengths and weaknesses. Also, the finding are in line with Mahdavinia and Ahmadi's study [70], which had shown that using portfolio assessment in class helped students experience self-directed learning, improve their self-confidence, develop self-assessment skills, have a stress-free class, experience a friendly relationship between the teacher and the students, develop their reading, writing, listening, and speaking, and enhance their interest and desire in learning English.
Regarding other studies, again, the finding is in line with the work of Yang [71] and Muin et al. [9] which reported that participants had positive reactions toward using portfolios as a tool for learning and assessment. Students described experiencing a portfolio in their learning as successful. Moreover, portfolios helped enhance participants' learning awareness, facilitate their learning process, and boost their learning autonomy.
Moreover, in line with the work of Lo [72]; Kalyaniwala and Ciekanski [46]; and Shih [21], the finding shows that the participants had neither experience of compiling a portfolio nor knowledge of autonomy. e participants' major tasks were to manage their time and learning and develop their skills. It is concluded that the portfolio enabled participants to involve in a learning context and practice autonomous learning. Moreover, the participants' learning awareness was enhanced.

Conclusions
A portfolio plays a vital role in improving students' writing skills. It is an effective instructional technique as well as an assessment tool that can provide evidence of knowledge and skills. In the EFL context where learning, teaching, and assessment are interrelated, the portfolio can be used as an appropriate mechanism. It can be used to improve the development of EFL learners' writing ability and has a positive effect on their autonomy. In fact, assessment should be considered as a collaborative formative process that helps learners establish a goal to develop their abilities. Learners took the responsibility for their own learning. At the same time, they learned how to be independent and autonomous which is the aim of the learning and assessment.
As a summary of the result of this study, using portfolio assessment techniques can provide useful information about the process of learning. In addition to teacher feedback, learners' engagement and involvement by self-assessing in the process of assessment are considered possible ways of practicing their independence and can remove the gap between what has been taught and what has been learned. In portfolio assessment, researchers have a process of assessing, diagnosing, and the feedback that engages learners; hence, they become more autonomous, responsible, and creative. e result reemphasized the effect of portfolio assessment on Iranian EFL learners' writing ability and autonomy. It should be mentioned that, in portfolio assessment by providing feedback to the learners and engaging them in the process of learning, they can motivate them to improve their general writing ability as well as other writing subskills such as elaboration, organization, content, and vocabulary. Moreover, by studying learners' writing, it was revealed that learners could differentiate descriptive writing from other types of writing, and during the course, they gradually became familiar with the principles of descriptive writing and tried to use them in their writing.
Although the autonomy of the learners was under the focus of this study, the researchers observed that, after receiving the comments and feedback from their teacher, learners paid more attention to their own written texts and tried to find out if they had any clear mistakes. Learners in the experimental group also showed more interest in writing descriptive paragraphs in comparison to the learners in the control group. One reason for this behavior could possibly be linked to the support (feedback and comment) they received from their teacher. On the whole, the atmosphere in the experimental class seemed to be more positive considering their collaboration, working together, and seeking help from each other.
In conclusion, based on the results achieved from the research questions, portfolio assessment has a positive effect on Iranian EFL learner autonomy and writing skill on both upper-intermediate and advanced levels significantly, but this method was more effective for advanced groups. e implication is that portfolio assessment can improve writing ability and can be considered as a motivating strategy. e results of the quantitative analysis revealed that portfolio assessment enhanced learner autonomy and writing skills in the experimental group significantly and offered them the opportunity to reflect upon their learning process, growth, and progress.
Due to some limitations of this study, such as the number of students involved, perhaps further studies should be conducted by adding the number of students as well as a moderate variable such as students' different learning styles in order to obtain more thorough insights related to the power of portfolios in writing classes.
Data Availability e datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request. Please contact the author for data requests at cyrosizadpanah@yahoo.com.