Adoption of Mobile Commerce Services by Individuals: A MetaAnalysis of the Literature Yousuf S. AlHinai Department of Information Systems The University of Melbourne yalhinai@squ.edu.om Sherah Kurnia Department of Information Systems The University of Melbourne sherahk@unimelb.edu.au Abstract Mobile commerce has been a huge success in terms of individuals’ adoption in some markets like Japan, while, surprisingly, not as flourishing in others. Many studies have been conducted using traditional adoption models and theories (such as TAM) that mainly focus on technology aspects. A more complete understanding of the issue requires the need to integrate three roles that m-commerce users play: as technology users, network members and as consumers. In this study, we review existing literature on individuals’ voluntary adoption of mobile commerce services to highlight the adequacy/inadequacy of previous studies’ coverage of these three roles. We observe that there is a lack of a complete understanding of mobile commerce adoption in the current literature. Several implications for future research and practice are discussed. 1. Introduction Mobile commerce or m-commerce is defined as any direct or indirect transaction with a potential monetary value conducted via wireless telecommunication networks [1]. Using mobile services, users can send/receive emails, download music/graphics/animations, shop for goods and services, play interactive online games, trade stocks, book tickets, find friends, conduct financial and banking transactions and so on. One of the main benefits of using m-commerce services is the ability to carry out tasks anywhere, anytime. Given such uniqueness, mobile commerce has been a huge success in some markets such as Japan. However, interestingly this innovation has not been as flourishing in other markets such as the USA and Australia. Robert B. Johnston Department of Information Systems The University of Melbourne robertj@unimelb.edu.au This issue has drawn a lot of attention from researchers to understand the factors that drive individuals’ adoption/rejection of this innovation. Many studies have been conducted using traditional adoption models and theories such as the Technology Acceptance Model (TAM) [2, 3], the Theory of Planned Behaviour (TPB) [4] and the Diffusion of Innovation (DOI) theory [5]. However, many authors (e.g. [6-10]) have drawn the conclusion that traditional adoption models are insufficient to gain a comprehensive explanation of the factors that affect individuals’ intentions to adopt or reject the use of mobile commerce services. One of the major reasons for this insufficiency lies in the kind of role(s) played by m-commerce services users compared to roles Played by users of traditional technologies such as PCs. Traditional technology users have mainly been studied in terms of their role as technology users through their interaction with the technology itself and as network members through interaction with other people. Users of m-commerce services, on the other hand, play a threefold role: as technology users, as network members, and as consumers [11], [10]. Therefore, to fully understand individuals’ adoption of mobile commerce, these three roles or perspectives have to be integrated. In this study, we review existing literature on individuals’ voluntary adoption of mobile commerce services to highlight the adequacy/inadequacy of previous studies’ coverage of the three roles mentioned. We observe that there is a lack of a complete understanding of mobile commerce adoption because most studies have concentrated on investigating the issue based on the technology user perspective using traditional adoption theories. In addition, a smaller number of studies have considered the role of mcommerce users as network members and far fewer have investigated their role as consumers. In 1 this study, we further argue that a more complete understanding of mobile commerce adoption can only be obtained if the three roles of the users are considered in mobile commerce adoption studies. Based on this review, directions and recommendations for future research are identified. Thus, this study helps synthesize prior research on the topic and streamline the efforts of current and future researchers in a common direction. It also helps different stakeholders and practitioners in the mobile industry to get a more focused insight into the research on mobile services acceptance and make better judgments and decisions in their offers to the mobile service users. The paper is organized as follows. Section 2 discusses what makes the adopters of m-commerce services different than the adopters of traditional technologies. Section 3 outlines the boundaries of this review and the research approach followed. Section 4 presents the findings and discussion. Finally, section 5 concludes with recommendations for future research. 2. The uniqueness of mobile commerce adopters Mobile commerce users are more than just technology users. Two other roles make them unique compared to adopters of traditional technologies such as computers, fax machines and software. First, they are usually part of a social network of people such as friends and family. This network would usually influence an individual’s perceptions, opinions and actions in regard to different objects including service offers. People usually recommend good services to each other and equally they oppose and discourage unfavourable services to each other. Therefore, depending on the level of interaction with others, the decision to adopt or reject a certain service in not only a result of a mere personal evaluation, but is usually affected by others. Second, in order to be able to use a mobile commerce service, an individual first needs to subscribe to a mobile telephony service with a service provider. Only after becoming a mobile phone user, he/she can make a decision about becoming or not becoming an m-commerce adopter. Consequently, being a customer of a business in the first place raises the importance of many factors that can affect subsequent intentions and decisions to accept new service offers. A customer’s evaluation of such factors can result in either positive or negative outcomes. In either case, this evaluation would have an impact on his/her future service adoption decisions. Therefore, there are three roles that have to be considered when investigating individuals’ adoption of m-commerce services as explained below (figure 1): Technology User Consumer Network Member Figure 1. Roles played by mobile commerce users (adopted from Pedersen, Methlie and Thorbjørnsen 2002) 2.1. M-commerce adopters as technology users This perspective, in its bases, conforms to traditional technology adoption research concepts. Here, all adoption factors studied relate one way or the other to the technology or service characteristics and its use. Studies investigating this role mainly use traditional theories such as the Technology Acceptance Model (TAM) [2, 3], the Theory of Planned Behaviour (TPB) [4] and the Diffusion of Innovation (DOI) theory [5]. Based on these theories researchers of mobile commerce adoption studied the effects of factors such as usefulness, ease of use, enjoyment of using a service, content and system quality, impact of technical issues such as bandwidth and line capacity and so on. 2.2 M-commerce adopters as network members This perspective or role takes account of factors that relate to the user’s surroundings and interactions with other people in his/her personal network of family, friends, colleagues and other important people. This perspective is based on the fact that an individual’s decisions and behaviours are not made solely by him/her, but rather are influenced by the opinions and recommendations of other important people. As a person is part of a social network, he/she normally interacts with others in daily life and talk and share with others what he/she sees, thinks and experiences. That is why, for example, word of mouth is known as one of the most effective channels through which 2 positive and negative ideas and perceptions spread in a social setting. Ignoring such effects in mcommerce adoption research would result in an incomplete understanding of the power of social networks in impacting one’s beliefs, attitudes and perceptions. Some traditional adoption theories such as TRA and TPB included such influences as part of their basic concepts. Mobile commerce adoption researchers (for example, [12] [13] [14]) used these role to better understand its adoption by individuals. It is crucial to include such factors because the usage nature of many m-commerce services (e.g. mobile chat services) requires interaction with others. Therefore, researchers in the area have accounted for factors such as subjective norms and recommendation of important others. 2.3 M-commerce adopters as consumers This role or perspective makes a key difference between m-commerce adoption research and adoption research on most traditional technologies. The majority of adoption determinants that influence individual acceptance of traditional technologies (such as PCs) mostly lie in the interaction of the user with the technology and/or with people around him/her. However, the case with mobile services is different. Mobile service users are normally customers of a business and pay fees in order to receive services for as long as they remain customers of the business. * There is therefore a continuous interaction between the mobile customer and his/her service provider(s). Such interaction opens the door to a wide rage of adoption determinants that might not be as crucial for traditional technologies adoption. Not integrating the factors that stand behind the fact that m-commerce adopters are also consumers or customers of a business would result in a deficient view on the issue. As stressed above, prior to adopting any m-commerce service, a person would normally decide on becoming a customer of a certain service provider to get his/her mobile telephony service. From that point on, an association is built between the customer and the business in which he/she is affected by everyday experiences with the company. Therefore, there are many factors that accumulate to form and influence individuals’ intentions to adopt or reject a service provided by a company. Failing to integrate such factors would result in only a partial explanation of the topic. Consequently, this perspective gives importance to the impact of marketing and business related factors such as cost/price, value perceptions, promotions, offers and people exposure to the services through different marketing efforts. Unlike the other two roles, the consumer perspective is new to the technology adoption research. Therefore, to understand what factors influence individuals based on this perspective, researchers may need to investigate and integrate theories from areas other than Information Systems. Unless such integration is made, there will always be a lack of a complete understanding of consumers’ adoption of mcommerce services. As a result focusing on m-commerce adopters as technology users only would mean omitting a great deal of factors related to the other two roles. Unless enough consideration is given by researchers to all three roles, the recommendations, advices and practical implications provided by research to mobile stakeholders will be incomplete and inadequate. 3. Research boundaries and approach of the meta-analysis During the past few years, mobile commerce adoption research has grown dramatically. A large number of studies have covered the topic from different angles and tens of more studies are added to the literature every year. The following review is by no means exhaustive, it aims to highlight to researchers and practitioners how the research has been progressing and build a ground on which future research can be directed. The review is guided by relevance to the three roles explained in section 2. [15] recommend precision about the boundaries and scope of literature reviews in Information Systems in order to make them more informative and insightful to fellow researchers and practitioners. Following this guideline, some decisions had to be made in order to establish the specific focus and boundaries for this review. First, mobile technologies and services can be used in many different contexts such as Business to Business (B2B), Business to Consumer (B2C) and social contexts. Since each of these contexts has distinct implications on the kind of theories and concepts used by relevant studies, a decision had to be made on which context this review concentrates on. Second, because research on mobile commerce is very wide and dramatically expanding, it was important to decide on which 3 branch of m-commerce research this study focuses. Third, the nature of mobile ‘services’ (such as mobile internet) has many unique implications on adoption research that might not be of the same significance when studying the adoption of mobile ‘technologies’ (such as cell phones). Therefore, it had to be decided if this review investigates the adoption of mobile services or mobile technologies. Fourth, some mobile services are tailored for individuals use while others are targeted towards businesses and organizations needs and use. Studying individuals’ adoption of m-commerce is different than investigating its adoption by businesses in terms of the theories, concepts, and perspectives that have to be considered. Hundreds of studies exist on each of these two lines and, therefore, a choice had to be made about which one this review focuses on. Finally, past adoption research made a clear distinction between voluntary adoption and compulsory adoption. Each of these kinds of adoption significantly differs in terms of its underlying determinants and decision processes. As a result, it had to be decided which kind of adoption to concentrate on. Based on the above, the following identifies the precise boundaries of this review and the scope it covers: 1- Focus on B2C and social contexts (as compared to B2B, business, organizational and work environments) 2- Focus on the mobile commerce adoption literature (as compared to other branches of the literature such m-commerce applications, m-commerce infrastructure, m-commerce business models, etc) 3- Focus on adoption of mobile services (as compared to adoption of mobile technologies such as cell phones, walkietalkies, etc) 4- Focus on Individual users’ adoption as the level of analysis (as compared to adoption of m-commerce technologies and services by organizations and businesses) 5- Focus on voluntary adoption and use (as compared to compulsory or forced adoption by management, for example) Consequently, this review concentrates on reviewing studies that investigated: Individuals’ Voluntary Adoption of Mobile Commerce Services The above defines an appropriate set of boundaries for this review because it seeks a focused view on the topic. Mixing each point in the list above with its alternatives would mean mixing different concepts on somewhat uncommon grounds. For example, factors affecting individual’s voluntary adoption differ from those influencing compulsory adoption. One point of difference is the fact that when voluntarily adopting a mobile service, individuals usually personally bear all risks and costs associated with their adoption actions (albeit monetary, emotional, etc). Such a small difference largely reflects on the kind of factors, concepts and theories that have to be considered. Similarly, discussing issues relating to individuals’ adoption of services in social contexts involves a different set of perspectives and considerations compared to studying businesses’ adoption of mobile technologies in organizational and work contexts. Studies examined in this review came from journals such as Journal of Electronic Commerce Research, Information and Management, Journal of American Academy of Business, Decision Support Systems, Electronic Commerce Research and Applications, Communication of the ACM, Journal of consumer marketing and Journal of Interactive Marketing. Other studies were published in conferences such as Hawaii International Conference on System Sciences (HICSS), International Conference on Mobile Business (ICMB), and Bled eConferences. Since research in the area is relatively recent, studies reviewed covered the period 2000 to 2006. Because of the large number of studies on the topic, the authors had to make a judgment in terms of how each study conceptually differentiates itself from other studies based on the three roles emphasized (section 2). 4. Findings and discussion Following the basics of traditional adoption and diffusion research, m-commerce adoption researchers built on these basics to develop models that included various variables and concepts drawn from Information Systems, Psychology, Sociology, Marketing, Economics and other fields. One of the main baselines of all adoption and diffusion research comes from the concept that humans tend to act or behave according to their predetermined intentions. Intentions are formed by the accumulation of positive and/or negative attitudes towards an object (a service, a product, a person, an organization, an idea, etc). These attitudes are a result of various perceptions stemming from past experiences and interactions that people encounter in their daily lives. 4 Building on this line of logic, researchers have therefore focused on users perceptions in regard to a wide range of factors. Table 1 on the next page presents a summary of the most frequently studied adoption factors and how they relate to each of the three roles or perspectives played by m-commerce adopters. The table also shows if there is a consistency/inconsistency in the results found on each group of factors. From the table, many observations can be made. First, the vast majority of studies have investigated m-commerce adopters as technology users. This is not surprising since most mcommerce research used traditional technology adoption theories and concepts that have mostly focused on technology aspects. However, it can also be noted that not all technology-related factors came from traditional theories. The unique context and characteristics of mobile commerce services required the addition of many new technology related determinants such as content availability and quality, connection speed, service speed, bandwidth, and other technical issues. The technology user perspective has heavily been investigated in the current literature. By far, the Technology Acceptance Model (TAM) [2, 3] and it usefulness and ease of use context is the most frequently used theory in such studies. Second, a number of studies have examined factors based on m-commerce adopters’ role as network members. Most of these studies combined such factors with ones related to adopters as technology users. This combination allowed researchers to get a better understanding of important factors that affect individuals’ intentions and adoption behaviours. This line of factors is not new to the traditional adoption research since network and people effects on individuals’ perceptions have been investigated in past studies using traditional theories such as TRA, TPB and DOI. The inclusion of determinants that relate to individuals as network members is very crucial because the use of many m-commerce services depend on the interaction between the user and other people (mobile chatting and fiend find, for example). Third, very few studies have investigated the adoption factors related to the role of m-commerce users as consumers. While some studies included factors related to this role along other technologyuser and network-member determinants, the level of emphasis given to this perspective if very minimal. There seem to be a lack of understanding among researchers in the area of the criticality of including this perspective along the other two. Only a few attempts have been made on this side. Pedersen and his colleagues [11] were among the first to note the need for a triangulation of the three roles highlighted in this study when examining the adoption of m-commerce services. They integrated concepts from Diffusion, adoption, uses and gratification and domestication research in order to come up with a better view and understanding of the issue. [10] On the other hand integrated and extended the concepts of TAM using concepts from the theory of consumer choice and decision making from economics and marketing research to come up with a value-based understanding of the issue. Fourth, the long list and the variety of factors that have been investigated in the current literature can be understood by the kind of mobile services and the contexts investigated in each study. The nature of different services produces a different set of important factors. For example, investigating individuals’ adoption of mobile Internet services where WWW content can be accessed through a mobile screen- may involve a different set of influences compared to mobile parking services where simple SMS is the way to exchange needed information. Because of the wide variety of services under the umbrella of mobile commerce and their unlimited use contexts, the scope of combining existing factors and adding new ones by each study is, therefore, broad. Fifth, while the table shows some factors where a common sense of significance has been reached, it is important to note the fact that empirical research in m-commerce tends to be country, sample, context, and service dependent. Each of these factors produces different set of results. For example, investigating the adoption of mobile Internet among professionals might yield a different set of conclusions compared to a group of teenagers. On the other hand, studying the adoption determinants of an application in a mature market like Japan could also give different outcomes than if the same study was carried out in another market or culture. However, such unanimous conclusions, despite underlying differences in the empirical investigation, gives valuable and very critical insights to relevant organizations operating in more than one market. 5 Table 1. M-commerce adoption factors in the existing literature Factor(s) Example studies Perspectives/roles tech Usefulness, performance expectancies Enjoyment, playfulness Expressiveness, image, lifestyle enhancement User satisfaction (with using the service itself) Relative advantage and perceived value Technical Issues such as connection speed, service speed, bandwidth, device limitations, etc Contents and functions availability and quality Personal innovativeness Behavioural Control (self-efficacy, facilitating conditions, etc) Compatibility, prior experience, relevant past knowledge Ease of use, complexity, effort expectancies Service cost, price, fee, perceived financial cost, perceived financial resources Trust, Risk, Security, perceived credibility, privacy issues associated with using a service Subjective norm (peer influence, external influences, normative beliefs, others recommendations) Triability, exposure to service through marketing Net Comments Cons [6, 7, 16-19] [7, 9, 10, 18, 20] * Direct/indirect effect on Intentions was found * Direct/indirect effect on Intentions was found [7, 9, 21] * [21-23] * [10, 24] * [10, 23, 25, 26] * [16, 18, 22, 23, 26] * [6, 25, 27, 28] * Direct/indirect effect on Intentions was found * Direct/indirect effect on Intentions was found * * Direct/indirect effect on Intentions was found Direct/indirect effect on Intentions was found Direct/indirect effect on Intentions was found Direct/indirect effect on Intentions was found [6, 7, 9, 25, 29, 30] Mixed results were found * [1, 16, 19, 24, 28] * Mixed results were found * [1, 7, 16, 18, 19, 24-26, 28, 31] Mixed results were found * [1, 10, 21-23, 25, 30-32] * * Mixed results were found [1, 6, 22, 24, 30, 31] * * Mixed results were found [6, 7, 9, 13, 21, 22, 24, 25, 29, 31] [19, 21, 24, 26, 29] Mixed results were found * * * * Mixed results were found 6 5. Conclusions and recommendations for future research Based on the preceding discussion, it can be seen that there is a lack of a complete understanding of the three roles that mobile commerce adopters play. Such understanding will allow researchers and practitioners to gain better insights on the factors that influence m-commerce adopters’ intentions. While the current literature has given a lot of attention to factors affecting adopters given their role as technology users, less has been given to the network member role. Adopters’ role as consumers or customers has been left with insufficient exploration (Table 2). Table 2. Level of exploration of adopter roles in the current literature Adopter Role Status Technology user Widely explored Network member Scarce to explored Consumer/Customer Unexplored Some recommendations for further research are outlined below. First and most importantly, more studies integrating the three perspectives presented in this study are needed in order to gain a comprehensive view on the adoption determinants that influence individuals’ intentions and decisions. A complete understanding of the issue requires more efforts from researchers to integrate consumer, marketing, and business influences in their studies. This would mean going beyond the theoretical and conceptual bases of Information Systems. The Information Systems field by its definition is inter-disciplinary. Therefore, for any IS issues to be fully comprehended, investigation must span over other related areas. For this to be achieved, one suggestion would be joining forces with other experts and researchers from related areas such as Marketing, Economics, Human Behaviour, Consumer Behaviours and Management. Such extensions would allow practitioners to gain greater benefits from studies conducted. Second, it has been highlighted that the beginning of any new technology passes through three stages: substitution (people use it only as a substitute of similar innovations), adaptation (people discover new ways of using the innovation), and revolution (people actually start to use the innovation in new ways) [33]. This concept applies to m-commerce services because most mobile services either substitute another innovation or replace a manual way of performing a task. For example, mobile Internet could substitute many aspects of traditional wired internet, mobile banking could substitute physical and wired internet banking, and mobile chat could also substitute its PC-based counterparts. Given this, researchers of m-commerce adoption have to understand the requirements of each applicable stage and how these requirements impact the attitudes, intentions and decisions of potential adopters. For example, a focus on the substitution stage shows the importance of comparative studies with similar or related technologies such as electronic commerce. According to [34] this area of research is still highly unexplored. Third, the majority of studies on individuals’ adoption of m-commerce services investigated adoption decisions are cross-sectional and therefore are limited to a certain point of time. However, very few, if any, studies have investigated how individuals’ reactions change over time [30], [19]. Such longitudinal research in m-commerce will help determine which factors of adoption are more salient than others. For example, [1] found that ease of use does not have a significant effect on intentions to use mcommerce. They explained such finding postulating that consumers change their ease of use perceptions about a specific system over time as they become more familiar with the system. This indicates that time has an effect on the significance people give to each adoption factor or determinant. Longitudinal adoption studies that pay attention to such changes will have a great impact on theory as well as practice. Consequently, relevant marketing and management polices, strategies, and efforts can be more effectively carried out and distributed over time to cope to the changes consumers go through. Finally, while conceptual studies add acknowledgeable contributions to the current literature, more empirical studies are needed. This review joins previous calls for more empirical tests in the m-commerce area in order to come up with more reliable and practical recommendations for relevant stakeholders [34, 35]. On another side, there is also a need to extend such efforts to crossnational and cross-cultural scales [21]. There have been some attempts on this path (see for example, [27], [36] but these are still scarce. The need for such studies arises given the fact that existing oneculture one-sample empirical studies are context and sample dependent which makes them hard to generalize. For greater insights, interested researchers from various countries should work together on validating and testing existing and new models in their respective cultures. Such 7 comparative studies would highly help and develop the research area as well as assist national and multinational corporations in the market to better customize their efforts and strategies. While this review is in no way exhaustive, it theoretically adds to the growing body of IS literature in general and to the mobile commerce adoption research in specific. This conceptual examination of various m-commerce adoption studies will help future researchers to observe the trends and design studies on mobile commerce adoption appropriately and therefore significant contributions can be made to both theory and 6. References [1] Wu, J.-H. and S.-C. 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