ness models in the user layer can revise the business logic of the consumer segment of the telecom industry with, e.g., advertisement-driven business models. During this research software as a service (SaaS) has grown into a relatively large market segment. There exists a natural synergy in CSP business and SaaS, which makes analysis of alternative value networks enabled by SaaS very useful though challenging. Finally, the insights gained in the analysis of the OSS/BSS industry provide a fruitful basis for analyzing other vertical software markets as well as for cross- industry comparisons based on indicators. Through this work a deeper under- standing on the dynamics of vertical software industries will be gained. References Agarwal R (1998) Evolutionary trends of industry variables. Int J Ind Organ 16(4):511-525 Argawal R, Audretsch DB (1999) The two views of small industry dynamics: a reconciliation. Econ Lett 62(2):245-251 Ali-Yrkkö J and Martikainen O (2008) The Impact Of Technological And Non-Technological Innovations On Firm Growth. Helsinki, ETLA, The Research Institute of the Finnish Economy, p. 19 (Keskusteluaiheita, Discussion Papers; ISSN 0781-6847; no. 1165) Altenberg L (1995) Genome growth and the evolution of the genotype-phenotype map. In: Banzhaf W, Eckman FH (eds) Evolution and biocomputation. Springer, Berlin, pp 205-259 Ansoff HI (1987) The emerging paradigm of strategic behavior. Strategic Manage J 8:501-518 Barney JB (1991) Firm resources and sustained competitive advantage. J Manage 17:99-120 Bass F (1969) A new product growth model for consumer durables. Manage Sci 15:215-225 Bekkers R and West J (2006) The effect of strategic patenting on cumulative innovation in UMTS standardization, DIME Working Paper, No. 8 Bell J (1995) "The internationalization of small computer software firms A further challenge to "stage" theories". Eur J Mark 29(8):60-75 BMBF (2000) Analyse und Evaluation der Softwareentwicklung in Deutschland. Bundesministerium für Bildung und Forschung, German Bower JL and Chris