Classification and Improvement Strategy for Design Features of Mobile Tourist Guide Application: A Kano-IPA Approach

An increasing number of people are using mobile applications to obtain travel-related information and activities due to the prosperity of the internet and mobile technologies nowadays. ,e design, development, and improvement of mobile tourist guide application (MTGA) are particularly important for travel-related companies. As an emerging application scenario of mobile technologies in the field of tourism, existing research onMTGA lacks analysis of its specific design, especially from the perspective of users to investigate the microscopic design features and improvement strategies. ,e Kano model was adopted by prior studies to analyse product quality attribute, while importance-performance analysis (IPA) was used to prioritize quality attributes for improvement. However, due to the limitation of the Kano model in neglecting the attribute performance and importance and the weakness of IPA in considering only the one-dimensional quality attributes, the use of single approach has its shortcomings for analysing the design features of MTGA.We attempt to integrate Kano model and IPA to conduct a study on the classification and improvement strategy issues for the design features of MTGA. Particularly, we identify design features of MTGA first, propose a method to classify them, and determine their priorities for developing and improving as well. An online questionnaire survey is conducted. ,e paper extends research on Kano model and IPA into the domain of mobile application design and provides insights into management strategies about the design of MTGA, which also offers novel and important implications for travelrelated companies to increase the users’ satisfaction by optimizing their mobile application design.


Introduction
In recent years, the growing popularity of mobile technologies has dramatically changed the ways in which online service operates and delivers in tourism industry [1]. e advanced computing capability and ubiquitous features of mobile device empower it to be an essential tool for travellers [2]. e penetration of mobile technologies into tourism industry changes the behavior of tourists [3,4] and also attracts attentions of scholars [5]. For example, tourist recommendation system [6], location-based smart tourism information system [7], smart audio tour guide system [8], and personalized location-based mobile tourism application [9] are hot topics of recent related studies. Among them, location-based services (LBS) are information and entertainment services that can be accessible with mobile devices via the mobile network. Taking advantage of the ability to utilize geographic location of mobile devices, the MTGA is a typical case of location-based services [10]. MTGA utilizes the positioning function of mobile device and combines various technical means such as network, wireless communication, and voice system to provide tourists with selfguided services. In contrast to traditional tour guide service, MTGA allows users to abandon or modify tours at any time [11], and it also provides more comprehensive, accurate, and convenient experiences. e emerging of MTGA not only makes up for the deficiency in traditional tour guide service, but also meets the personalized needs of tourists [12]. rough a review on recent related literature, we discover that a number of existing researches on mobile applications empirically investigate users' acceptance or intention to use mobile applications. For example, Lai [13] investigated tourists' technological acceptance of a MTGA. Chen and Tsai [9] studied the factors affecting users' intention to use the mobile tourism application. Lei et al. [14] explored users' perceived technology affordance and value of mobile applications. Fang et al. [1] empirically examined the factors influencing users' engagement behavior of mobile travel applications. Information system literatures inform us that the design of information system has a considerable impact on the operation, performance, and success of enterprises [15]. Mobile application, as a specific information system, is of great importance since it provides an effective channel for enterprises to communicate and forge intimate relationships with their customers [1]. In order to retain committed and engaged customers as well as increase sales, enterprises should place particular emphasis on the design of their mobile applications.
Although MTGA enables users to obtain tour guidance information as needed anytime and anywhere [16], the issues such as complexity when operating, lack of useful information, and information overload severely reduce its effectiveness. We address the fact that these problems are closely related to the insufficiency of extant studies on design features of MTGA. Despite research on this topic, studies regarding user satisfaction and improvement strategies for the design features of MTGA from user's perspective have been few in number. In terms of describing the relationship between product or service design and user satisfaction, Kano model is a classic method. As user's expectations vary among different design features of MTGA, Kano model is appropriate to depict the asymmetric and nonlinear relationship between design feature and user satisfaction [17]. Based on the Kano model, this paper complements the extant research by investigating users' satisfaction with the various design features of MTGA, determining the Kano classification of design features, and analysing their priorities to improve through combining with IPA. is work also provides implications for practitioners to build the development and optimization strategies for designing MTGA that well satisfies the needs of users.

Mobile Tourist Guide Applications.
While the topic of mobile travel applications has been under research for many years, it is only in the recent years that MTGA began to receive attentions across the tourism industry. Currently, there are two main streams of literature on MTGA. e first is design-science-based one. For example, Chu et al. [18] integrated geographic information system and global positioning system technologies into a MTGA, which can provide tourists with LBS information at popular tourist destinations. Smirnov et al. [19] proposed a mobile application, which generates recommendations for the tourist about interesting attractions around. Kang et al. [8] developed the location-based audio tour guide application using speech synthesis technology, which is helpful for enhancing self-guided tours of destinations. Tarantino et al. [20] proposed an interactive electronic guide application prototype, which can recommend personalized tourist routes to mobile users, and evaluated the effectiveness of the prototype through an experimentation. Such studies heavily analyse the design, development, or implementation of MTGAs and discuss their main advantages and limitations. e second stream of MTGA research is empirical study regarding user behavior. Based on unified theory of acceptance and use of technology, Lai [13] identified antecedents and determinants influencing tourists' acceptance of a MTGA through a questionnaire survey of 205 tourists visiting Macau. Chen and Tsai [9] investigated users' intention to use a mobile tourism application by integrating the technology acceptance model and the information system success model. e results showed that information quality, perceived ease of use, and perceived usefulness significantly affect the intention to use, while information quality and perceived convenience affect perceived usefulness. is kind of studies is mainly to empirically investigate user behavior through questionnaire survey, such as technological acceptance and intention to use. Actually, MTGA is an IT artifact that consists of various design features, but most of the relevant literature fails to consider it from such a microscopic perspective which leads to a lack of deep look into the user satisfaction with different design features. Compared to existing research, this study focuses on specific design features of MTGA, and we expect to provide more precise and operable suggestions for the design and improvement of MTGA from a finer granularity.

Kano Model.
Inspired by Herzberg's two-factor theory, the Japanese scholar Noriaki Kano proposed the Kano model in 1984. e model divides product quality attributes into five categories according to the relationship between objective product performance and customer subjective feelings, namely, must-be quality, one-dimensional quality, attractive quality, indifferent quality, and reverse quality [17]. Figure 1 shows the relationship between quality realization degree and user satisfaction corresponding to the abovementioned five Kano categories. e Kano model has been applied to various research fields. For instance, Qi et al. [21] applied the Kano model to the analysis of online reviews to develop appropriate improvement strategies for product. Ilbahar and Cebi [22] classified the design parameters of e-commerce websites according to consumer expectations and evaluated the effectiveness of e-commerce websites. Go and Kim [23] grouped travellers based on the frequency of flights per year to investigate the differences in the Kano classification of each airline service quality element in different groups. Velikova et al. [24] applied the Kano model to the management of festival activities and investigated the factors affecting satisfaction with festival activities. In the context of mobile internet development and the popularity of smart devices, Yao et al. [25] explored the quality attribute classification of key functions in mobile security applications by using the Kano survey method to determine the importance ranking. Kuo [26] used the Kano model to categorize web-community service quality dimensions and their elements and provided suggestions for future improvement of web-community service. In the field of hospitality services, Chiang et al. [27] used the Kano model to classify technological innovation attributes for hotels and provided suggestions for managers to introduce innovative technologies. However, Kano analysis method has several limitations despite its wide application. For example, the Kano model usually classifies the quality attributes while ignoring the influence of the quality attribute on the increase or reduction of user satisfaction; thus, the priority of quality attributes for improvement cannot be determined. Hence, the present study attempts to improve the classification method of the Kano model and combines with another method, i.e., IPA, to make up for the identified shortcomings.

Importance-Performance Analysis.
IPA is a structural method that generates specific decision-making ideas by considering the users' perceived importance and performance. IPA places the values of importance and performance of each attribute into a two-dimensional coordinate plane, with their mean or median as a cross point to divide them into four quadrants, namely, keep up the good work (high importance and high performance), concentrate here (high importance and low performance), low priority (low importance and low performance), and possible overkill (low importance and high performance), as shown in Figure 2. Attributes in quadrant "keep up the good work" are considered good and should be maintained, and "concentrate here" attributes should be improved with many resources. Attributes in quadrant "low priority" have low priority for improvement, while those in quadrant "possible overkill" receive excessive resources that could better be allocated elsewhere. IPA is a common business analysis technique for understanding customer satisfaction and developing improvement strategies for products or services [28]. It has been applied in many related fields, such as food services [29], tour guide services [30], hot springs tourism [31], information system [32], smartphone applications [33], e-business [34], hotel [35][36][37], wildlife park [38], sustainable tourism [39,40], and nature-based tourism [41]. As a simple and effective method that helps determining the priority of quality attributes for improvement, IPA is instructive for proposing management strategies [42]. In the field of tourism, Coghlan [43] quantitatively analysed visitor satisfaction and its relation to tourism attributes on the Great Barrier Reef through the IPA model, determining high and low impact attributes and the range of impact of each attribute. Zhang and Chan [41] investigated the development of nature-based tourism in Hong Kong based on the IPA model from the perspectives of local residents and tourists, and the results show a difference in the level of attention to the factors affecting the tourism development between them. erefore, after the user satisfaction survey and IPA, scarce resources can be well scheduled to achieve a high level of user satisfaction [31]. Because of the weakness of considering only the one-dimensional quality attributes, the IPA model cannot obtain the accurate priority for improvement to all quality attributes. To this end, the combination of IPA with Kano model in this study can make better use of the advantages of both.

Kano-IPA Integration Model.
To avoid the limitation of the Kano model in neglecting the attribute performance and importance and exclude the drawback of IPA in considering only the one-dimensional quality attributes, existing literature has integrated the two approaches together to conduct research in many fields. For example, Lin and Chan [44] integrated Kano model with IPA for the purpose of enhancing service quality strategies and verified the validity through an online job agency case in Taiwan. Kuo et al. [45] combined Kano model with IPA to classify quality attributes of mobile value-added services and purpose appropriate management strategies. Pai et al. [46] used Kano model and IPA approach to investigate the restaurant service quality attributes in the chain restaurant industry. Huang [47] identified the improved priority of the service quality attributes of mobile healthcare through combining Kano

Scoping Design Features of MTGA.
e research object of this study is the design features of MTGA. Due to the premise that the study on the design feature of MTGA has been rather scant, we cannot recognize the specific design feature of MTGA by analysing the existing literature.
erefore, we install current mainstream MTGAs that can be downloaded from Android and IOS app stores to construct the MTGA repository for study. After a thorough decomposition and analysis of design features for all of the downloaded applications, 12 major design features that users interact with in MTGA are identified. e name and descriptive introduction of each design feature are shown in Table 1.

Questionnaire Design.
Following the paradigm of Kano model, a questionnaire consists of three parts is designed. e first part is Kano-based two-dimensional items in terms of the 12 design features of MTGA. Respondents are required to rate their perceptions considering both the presence and absence of each design feature of MTGA. e perceptions are measured on five levels of "like, must be, neutral, live with, and dislike." Second, perceived importance of each of the 12 design features are asked for by a scale from 1 being "very unimportant" to 5 being "very important." Perceived performance of each design feature is also inquired from 1 as "very unsatisfied" to 5 as "very satisfied." e third part of the questionnaire is questions about the demographic characteristics of respondents, which include gender, age, education level, preference for travel ways, preference for scenic types, and the number of average annual travel.

Classification of Design Features.
Based on the collected questionnaires, a basic classification of each design feature for each respondent is firstly conducted by the typical quality classification table of the traditional Kano model shown in Table 2. is traditional Kano method is able to classify design features but incompetent for measuring their impacts on the increasing of satisfaction or eliminating of dissatisfaction. Correspondingly, this study proposes an improved design feature classification method based on the concept of the user satisfaction coefficient proposed by Berger et al. [48].

Calculation of Better and Worse Indices.
e Better and Worse indices of the design features are calculated by using the typical quality classification results of the traditional Kano model. e absolute values of which are between 0 and 1. e Better index of design feature F i is calculated as where A i , O i , M i , and I i represent the quantity of results for design feature F i classified as A (attractive quality), O (onedimensional quality), M (must-be quality), and I (indifferent quality), respectively. e value of Better i is positive, thereby indicating the extent to which the provision of the design feature improves user satisfaction. A value close to 1 suggests a strong improvement effect on user satisfaction. On the contrary, the Worse index of design feature F i is calculated as in (2). e value of Worse i is negative, thereby describing the influence of exclusion of particular design feature in reducing total user satisfaction. A value close to −1 prompts a strong reduction effect.  (4): e rule of classification for design features is described as in (5). e type of each design feature is determined according to the relationship between their normalized Better index as well as Worse index and their corresponding averages. C(F i ) represents the Kano type of design feature F i .

Calculating Importance of Design Features.
In the past, most of the relevant research obtained the importance of design features through questionnaires. e process is often too tedious and its survey content is too much, increasing the burden of questionnaire fillers, thereby resulting in more difficult questionnaire collection. erefore, this paper proposes a method to measure the importance of design features quantitatively. e larger the Better i and |Worse i | values of the design feature are, the greater the impact of realization degree of the design feature on user satisfaction or dissatisfaction is, and the more important the design feature is. is study measures the importance of design feature by calculating the distance between the point of the two-dimensional plane and the coordinate origin, and the farther the distance is, the more importance it is. e calculation of importance W i of design feature F i is as shown in (6). Finally, the calculation results of the importance are normalized for further analysis.

IPA of Design Features.
e importance measure represents the vertical axis, and the performance measure represents the horizontal axis of a two-dimensional matrix. e importance and performance results of each design feature are placed in a two-dimensional matrix, with the average value as cross point to divide into four quadrants. en, based on the quadrants in the IPA matrix of design features, corresponding managerial strategies are proposed, and their priorities to improve under the situation of limited resources are determined.

Data Collection.
e questionnaire survey was conducted through the professional survey platform "wjx.com." A total of 214 questionnaires were collected, and 197 valid questionnaires were obtained after screening, yielding an effective rate of 92.06%. e ages of the respondents are mainly between 18 and 39 years old. In terms of gender, males account for 45.7% and females account for 54.3%. ose with bachelor's degrees account for 59.4% of the respondents, and those with graduate degrees account for 34.0%. Most of the respondents have more than 3 years' experience of using smartphone, and 87.3% of the respondents prefer independent travel. e Cronbach α coefficients for Kano dimension, importance dimension, and performance dimension are 0.856, 0.827, and 0.929, respectively, indicating considerable reliabilities for further analysis.

Results.
e frequencies of the respondents' basic classification results for each design feature are shown in columns "A"∼"Q" of Table 3. Traditional Kano model determines classification of quality attribute based on the Kano category with the largest frequency, which does not always work well, and the representation of which may be controversial [22,49]. erefore, this paper will adopt an improved method to determine the Kano categories of design Posting and reading online reviews regarding travel experiences. Related history and culture (RHC) Introduction to the history and culture with regard to scenic spots.  Figure 3 and the determined categories for each design feature are show in column "Category" of Table 3. Based on the method in Section 3.4, the calculated importance of each design feature is shown in column "Importance" in Table 3, followed by the performance of each design feature obtained in the questionnaire. e importance and performance results of each design feature are placed in a two-dimensional coordinate plane, with the average value as cross point, the IPA is conducted and the results are presented in Figure 4 and the last column in Table 3.
As demonstrated in Figure 4, under the framework of IPA, design features RR, TS, UT, and FN are placed in the quadrant of "keep up the good work," indicating that MTGA operators should endeavour to maintain the quality of these design features. Design feature AIR is in the quadrant of "concentrate here," meaning that MTGA operators should concentrate their resources on improving this design feature at first. Design features AT, SM, ME, TD, OR, and RHC lie in the quadrant of "low priority," indicating no urgent need for improvement. Design feature DO is located in the quadrant of "possible overkill," so reducing the resources allocated for this design feature may be a considerable policy.

Validity Test.
In order to verify the validity of the proposed method, it is necessary to compare our results with those of the existing methods. is study also sets up question items directly inquiring user's evaluation of the importance of each design feature when designing the questionnaire (e.g., "What do you think of the importance of design feature "online review" in mobile tourist guide applications?"), whereby 5-point Likert scales are used from 1 being "very unimportant" to 5 being "very important." After averaging all respondents, the directly measured importances of the 12 design features are 3.873, 3.782, 3.655, 3.533, 4.264, 3.898, 4.325, 3.431, 4.025, 4.396, 3.701, and 3.893, respectively. en, an IPA matrix with directly measured importance is drawn as shown in Figure 5. After comparing between the IPA matrix for design features of MTGA with our proposed method in Figure 4 and the IPA matrix with directly measured importances in Figure 5, it can be found that the quadrantal divisions of all 12 design features are consistent across the two matrices, suggesting the validity of our method. It is worth mentioning that our method reuses the Kano questionnaire data to generate the importances, which effectively reduces the workload of respondents for answering additional questions of the importance.

Discussions and Managerial Strategies
We derive several findings and managerial implications from the above processes and results. To interpret the results within Kano model framework, the Better index and absolute values of the Worse index of design features RR, TS, UT, and FN are higher than average, indicating that user satisfaction will be improved when these design features are provided in the MTGA while reduced when absent. ese four design features are "one-dimensional" design features, whose realization degree is approximately linear with overall user satisfaction, so MTGA that optimizes the design of these four design features may get a payback of higher user satisfaction.
e Better index values of design features AIR and RHC are higher than the average value, while their absolute Worse index values are lower than average. So, the user satisfaction will be higher when these design features are found in MTGA, but user satisfaction may not significantly reduce when these design features are missed. If the operator plans to further enhance the user satisfaction with the MTGA, attentions should be paid to the development and optimization of these two design features. Such "attractive" design features will enable MTGA operators to benefit from differentiated competition with competitors.
As the Better index and absolute values of the Worse index of design features DO, AT, SM, ME, TD, and OR are both lower than the average value, little changes in user satisfaction occur whether these design features provided in MTGA or not, manifesting their "indifferent" nature.
From the perspective of IPA, the design features in the quadrant "keep up the good work" and "possible overkill" should adopt the holding strategy. e user satisfactions of such design features are high, so their performance should be maintained. Further considering their importances, when deploying system development and design resources, the "keep up the good work" design features should hold greater priority over the "possible overkill" ones. On the other hand, the design features located in quadrant "concentrate here" and quadrant "low priority" should adopt the improvement strategy. e performance of these design features should be improved in general due to their low level of user satisfaction, whereas "concentrate here" design features would be prior to "low priority" ones regarding their importances. Considering the quality classification of Kano model coherently, the priorities of must-be quality attributes are highest, and one-dimensional quality attributes the second, followed by attractive quality attributes, and finally come the indifferent quality attributes. Synthesizing the principles of IPA and Kano, we provide managerial strategies for design features of MTGA as follows.
(1) Priority of Improvement Strategy. e design features of MTGA that adopt improvement strategy include AT, SM, ME, AIR, TD, OR, and RHC. e priorities of the attractive quality design feature are higher than the indifferent feature as ruled, and because the design feature AIR is located in the quadrant "concentrate here," its priority should be higher than RHC in the quadrant "low priority." Design features AT, SM, ME, TD, and OR, which lie in the quadrant "low priority," have the lowest priorities. (2) Priority of the Holding Strategy. e design features DO, RR, TS, UT, and FN of MTGA adopt the holding strategy. As the priorities of the one-dimensional quality design feature are ruled to be higher than that of the indifferent quality feature, the priority of design features RR, TS, UT, and FN should be higher than the design feature DO. It is observed that a quadrant may include multiple design features, in this case, the priority order of design features within the same quadrant can be determined after trading-off the importance, performance as well as the preferences, and available resources of the MTGA operator.

Conclusions
MTGA has been widely adopted by tourists and generated common concerns from academics and industries. However, if a MTGA is poorly designed, the effectiveness of service it delivers to users will be considerably reduced. Referring to the framework of the Kano model and IPA, this study investigates the design of MTGA from a relatively microscopic perspective. To the best of our knowledge, we are among the first few studies to focus on the design of MTGA on the level of design features. e present study makes substantial theoretical contributions to the literature and provides inspiring managerial implications for practitioners. Firstly, the results of online samples support the nonlinear relationship between the design features of MTGA and user satisfaction as Kano model suggests.
erefore, facing with resource constraints, MTGA operators would be of more benefit to user satisfaction with less cost when designing or optimizing MTGA if they take the nonlinear nature of design feature into consideration. Secondly, based on the Kano model and IPA, this paper classifies the 12 major design features extracted from mainstream MTGAs, determines the priorities of these design features for improvement, and further Mobile Information Systems advances managerial strategies, which provide instructive implications for practitioners to reap users' satisfaction by improving the design of MTGA. irdly, we provide a possible idea for retrenching the procedure of IPA by quantitatively measuring the importance of design features based on the positions on the coordinate plane. e consistent result of comparison with existing literature that measures importance through direct measurement items demonstrates the validity of our method. We reuse the Kano questionnaire data to generate importances of design features, which effectively reduces the workload of respondents to answer additional questions regarding importance. e present study also has certain limitations, which provide possible directions for future research. First, types of scenic spots (e.g., natural, cultural, or thematic) are not distinguished when assessing user needs for design features of MTGA. Actually, users' informational needs may differ across different types of scenic spots. Future research can further examine and integrate these differences into the research model. Second, the preferences of different user groups on the design features of MTGA may also vary due to different demographic characteristics, e.g., age, gender, education level, and occupation. In the future, the impacts of user profiles can be empirically studied to induce more accurate and effective strategies for the development and strategies of MTGA design. Finally, the traditional Kano model's two-dimensional questionnaire is not efficient and conducive to capture the accurate perceptions of respondents; future research can be done via methods such as regressions or mining user needs from objective datasets.

Data Availability
e data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest
e authors declare that there are no conflicts of interest regarding the publication of this paper.