References [1] De Vere, K., 2012. iOS device sales leapfrog android. Retrieved on June 2013 from: http://www.insidemobileapps.com/2012/07/24/ios-device-sales-leapfrog-android-with-410-million-devices-sold/. [2] Demirkan, H., Kauffman, R. J., Vayghan, J. A., Fill, H. G., Karagiannis, D., and Maglio, P. P., 2008. Service-Oriented Technology and Management: Perspectives on Research and Practice for the Coming Decade. Electronic Commerce Research and Applications, 7(4), 356-376. [3] Gebregiorgis, S. A., Altmann, J., 2015. IT Service Platforms: Their Value Creation Model and the Impact of Their Level of Openness on Their Adoption. Cloud Forward Conference2015, Procedia Computer Science Series, Elsevier. [4] Haile, N., Altmann, J., 2012. Value Creation in IT Service Platforms through Two-Sided Network Effects. In: Proceedings of the International Conference on Economics of Grids, Clouds, Systems, and Services, GECON 2012, Springer LNCS, 139-153. [5] Bieberstein, N., Bose, S., Fiammante, M., Jones, K., and Shah, R., 2005. Service-Oriented Architecture (SOA) Compass: Business Value, Planning, and Enterprise Roadmap. FT Press, Upper Saddle River NJ. [6] Nalebuff, B. J., Brandenburger, A. M., 1997. Co-opetition: Competitive and Cooperative Business Strategies for the Digital Economy. Strategy & Leadership, 25, 28-35. [7] Payne, A. F., Storbacka, K., Frow, P., 2008. Managing the Co-creation of Value. Journal of the Academy of Marketing Science, 36(1), 83-96. [8] Prahalad, C. K., Ramaswamy, V., 2004. Co-creation Experiences: The Next Practice in Value Creation. Journal of Interactive Marketing, 18(3), 5-14. [9] Vargo, S. L., Maglio, P. P., Akaka, M. A., 2008. On Value and Value Co-creation: A Service Systems and Service Logic Perspective. European Management Journal, 26(3), 145-152. [10] Amit, R., Zott, C., 2001. Value Creation in E-Business. Strategic Management Journal, 22, 493-520. [11] Lee, S., Kim, T., Noh, Y., Lee, B., 2010. Success Factors of Platform Leadership in Web 2.0 Service Business. Service Business, 4(2), 89-103. [12] Smedlund, A., 2012.Value Co-creation in Service Platform Business Models. Service Science, 4(1), 79-88. [13] Iansiti, M., Levien, R., 2004. Strategy as Ecology. Harvard Business Review, 82(3), 68-81. [14] Gawer, A., Cusumano, M. A., 2008. How Companies Become Platform Leaders. MIT Sloan Management Review, 49(2), 28-35. [15] Kim. K., Altmann, J., Hwang, J., 2011. An Analysis of the Openness of the Web2.0 Service Network Using Two Sets of Indices for Measuring the Impact of Service Ownership. HICSS44, Hawaii International Conference on Systems Science, Koloa, USA. [16] Kim, K., Altmann, J., Hwang, J., 2010. Measuring and Analyzing the Openness of the Web2.0 Service Network for Improving the Innovation Capacity of the Web2.0 System Through Collective Intelligence. COLLIN 2010, Symposium on Collective Intelligence, Springer Advances in Intelligent and Soft Computing, Hagen, Germany. [17] Kim, H. W., Chan, H. C., Gupta, S., 2007. Value-Based Adoption of Mobile Internet: An Empirical Investigation. Decision Support Systems, 43, 111-126. [18] Basole, R. C., Karla, J., 2012. Value Transformation in the Mobile Service Ecosystem: A Study of App Store Emergence and Growth. Service Science, 4(1), 24-41. [19] Katz, M. L., Shapiro, C., 1985. Network Externalities, Competition, and Compatibility. American Economic Review, 75(3), 424-440. [20] Liebowitz, S. J., Margolis, S. E., 1995. Path Dependence, Lock-in, and History. Journal of Law, Economics, & Organization, 11(1), 205-226. [21] Farrell, J., Saloner, G., 1985. Standardization, Compatibility, and Innovation. RAND Journal of Economics, 70-83. [22] Clements, M. T., 2004. Direct and Indirect Network Effects: Are they Equivalent? International Journal of Industrial Organization, 22(5), 633-645. [23] Economides, N., 1996. The Economics of Networks. International Journal of Industrial Organization, 14(6), 673-699. [24] Katz, M. L., Shapiro, C., 1994. Systems Competition and Network Effects. Journal of Economic Perspectives, 8(2), 93-115. [25] Parker, G. G., Van Alstyne, M. W., 2005. Two-sided network effects: A theory of information product design. Management Science, 51(10), 1494-1504. [26] Rysman, M., 2009. The economics of two-sided markets. The Journal of Economic Perspectives, 125-143. [27] Rochet, J.C., Tirole, J., 2004. Two-Sided Markets: An Overview. Institut d’Economie Industrielle Working Paper. [28] Rochet, J. C., Tirole, J., 2003. Platform competition in two‐sided markets.Journal of the European Economic Association, 1(4), 990-1029. [29] Gandal, N., Kende, M., Rob, R., 2000. The Dynamics of Technological Adoption in Hardware/Software Systems: The Case of Compact Disc Players. RAND Journal of Economics, 43-61. [30] Ohashi, H. (2003). The Role of Network Effects in the US VCR Market, 1978-1986. Journal of Economics & Management Strategy, 12(4), 447-494. [31] Shankar, V., Bayus, B. L., 2003. Network Effects and Competition: An Empirical Analysis of the Home Video Game Industry. Strategic Management Journal, 24(4), 375-384. [32] Park, S., 2004. Quantitative Analysis of Network Externalities in Competing Technologies: The VCR Case. Review of Economics and Statistics, 86(4), 937-945. [33] Clements, M. T., Ohashi, H., 2005. Indirect Network Effects and the Product Cycle: Video Games in the US, 1994–2002. The Journal of Industrial Economics, 53(4), 515-542. [34] Stremersch, S., Tellis, G. J., Franses, P., Binken, J., 2007. Indirect Network Effects in New Product Growth. Journal of Marketing, 71, 52-74. [35] Katz, M. L., Shapiro, C., 1986. Technology Adoption in the Presence of Network Externalities. Journal of Political Economy, 822-841. [36] Katz, M. L., Shapiro, Carl, 1992. Product Introduction with Network Externalities. Journal of Industrial Economics, 40(1), 55-84. [37] Farrell, J., Saloner, G., 1986. Installed Base and Compatibility: Innovation, Product Preannouncements, and Predation. American Economic Review, 940-955. [38] Arthur, W. B., 1989. Competing Technologies, Increasing Returns, and Lock-in by Historical Events. The Economic Journal, 99(394), 116-13. [39] Besen, S. M., Farrell, J., 1994. Choosing How to Compete: Strategies and Tactics in Standardization. The Journal of Economic Perspectives, 8(2), 117-131. [40] Zott, C., Amit, R., Donlevy, J., 2000. Strategies for Value Creation in e-Commerce: Best Practice in Europe. European Management Journal, 18(5), 463-475. [41] Vargo, S. L., Lusch, R. F., 2008. Service-Dominant Logic: Continuing the Evolution. Journal of the Academy of marketing Science, 36(1), 1-10. [42] Zhu, F., Iansiti, M., 2012. Entry into Platform-Based Markets. Strategic Management Journal, 33(1), 88-106. [43] Sterman, J., 2000. Business Dynamics. Irwin-McGraw-Hill. [44] Forrester, J. W., 1961. Industrial Dynamics. MIT press Cambridge, MA. [45] Freeman, R. E., 1984. Strategic Planning: A Stakeholder Approach. Boston, Pitman. [46] Mitchell, R. K., Agle, B. R., Wood, D. J., 1997. Toward a Theory of Stakeholder Identification and Salience: Defining the Principle of Who and What Really Counts. Academy of Management Review, 2(4), 853-886. [47] Altmann, J., Ion, M., Bany Mohammed, A., 2007. Taxonomy of Grid Business Models. In: GECON 2007, Workshop on Grid Economics and Business Models, Springer LNCS, Rennes, France. [48] Evans, D. S. 2003. Some Empirical Aspects of Multi-Sided Platform Industries. SSRN Electronic Journal. [49] Agarwala, S., Yuan, Chen, Milojicic, D., Schwan, K.,2006. QoS and Utility Aware Monitoring in Enterprise Systems. In: IEEE, 124-133. [50] McDougall, G. H., Levesque, T., 2000. Customer Satisfaction with Services: Putting Perceived Value into the Equation. Journal of Services Marketing, 14(5), 392-410. [51] Ginevičius, R., 2008. Normalization of quantities of various dimensions. Journal of business economics and management, 9(1), 79-86. [52] Apple iTunes, 2012. Retrieved on October 2012 from: www.apple.com/itunes . [53] Apple Development Kits, 2012. Retrieved on October 2012 from www.developer.apple.com/programs/ios/. [54] Amazon Appstore for Android, 2012. Retrieved on October 2012 from www.amazon.com/mobile%20apps/b/ref=sa_menu_mas2?ie=UTF8&node=2350149011. [55] Google Apps Marketplace, 2012. Retrieved on October 2012 from:www.google.com/enterprise/marketplace/. [56] Baek, S., Kim, K., Altmann, J., 2014. Role of Platform Providers in Service Networks: The Case of Salesforce.com AppExchange. CBI 2014, 16th IEEE Conference on Business Informatics, Geneva, Switzerland. [57] Haile, N., Altmann, J., 2013. Estimating the Value Obtained from Using a Software Service Platform," In: GECON 2013, LNCS 8193, pp.244-255. Springer, Switzerland. [58] Kim, K., Altmann, J., 2013. Evolution of the Software-as-a-Service Innovation System through Collective Intelligence. International Journal of Cooperative Information Systems, 22(3). [59] Breskovic, I., Altmann, J., Brandic, I., 2013. Creating Standardized Products for Electronic Markets. Future Generation Computer Systems, The International Journal of Grid Computing and eScience, 29(4), 1000-1011. [60] Risch, M., Brandic, I., Altmann, J., 2009. Using SLA Mapping to Increase Market Liquidity. NFPSLAM-SOC 2009, 3rd Workshop on Non-Functional Properties and SLA Management in Service-Oriented Computing, in conjunction with ICSOC 2009, 7th International Conference on Service-Oriented Computing, LNCS 6275. [61] Messerschmitt, D. G., Szyperski, C., 2003. Software Ecosystem: Understanding an Indispensable Technology and Industry. Cambridge, MA, USA: MIT Press. [62] Jansen, S., Brinkkemper, S., Finkelstein, A., 2009. Business Network Management as a Survival Strategy: A Tale of Two Software Ecosystems. In: Proceedings of the first International Workshop on Software Ecosystems [63] Cusumano, M. A., Gawer, A., 2002. The elements of platform leadership. MIT Sloan Management Review, 43(3), 51-58. [64] Jansen, S., Cusumano, M., 2013. Defining software ecosystems: a survey of software platforms and business network governance. (13-28). Edward Elgar Pub. [65] Perez S., 2014. iTunes App Store Now Has 1.2 Million Apps, Has Seen 75 Billion Downloads To Date. TechCrunch. Retrieved on May 2015 from: http://techcrunch.com/2014/06/02/itunes-app-store-now-has-1-2-million-apps-has-seen-75-billion-downloads-to-date/. [66] Zeithaml, V. A., Parasuraman, A., and Berry, L. L., 1990. Delivering quality service: Balancing customer perceptions and expectations. Simon and Schuster. [67] Varian, H. R., 2009. Intermediate Microeconomics: A Modern Approach, 8th. Ed, W.W. Norton & Co. [68] Chen, K. Heyde, C.C., 1995. On asymptotic optimality of estimating functions. Journal of Statistical Planning and Inference, 48(1), pp.101-112. [69] Hannan, J., 1973. The asymptotic theory of linear time series models. J. Applied Probab., 10, 130-145. [70] Kramkov, D., Schachermayer, W., 1999. The asymptotic elasticity of utility functions and optimal investment in incomplete markets. Annals of Applied Probability, 904-950. [71] Lekvall, P., Wahlbin, C., 1973. A study of some assumptions underlying innovation diffusion functions. The Swedish journal of economics, 362-377. [72] Ventana Systems, 2014. Vensim Software Version 6.3D. Retrieved on July 2015 from: http://vensim.com/.