CSP may consider whether to develop and maintain the new application or system using its own resources, or whether to buy a service to tailor the system specifically for them, or to acquire a license for a commercial off-the-shelf software component (COTS). The general model of software market evolution predicts a development where the internal software development in the industry enterprises disappears, and the portion of COTS licenses as well as the spending on software related services is increasing. The interviews were thus looking at the proportions of software development in-house, and the procurement of OSS/BSS software and related services (like integration projects) by considering two issues: 1. To what extent and for what reasons do CSPs develop software in-house; and 2. If software is acquired from external software vendors, what are the reasons a CSP uses for selecting its OSS/BSS software providers. With this, also the aspects of bespoken software or COTS are discussed with the interviewees. This exploration does not look at the application services provisioning (ASP) or software as a service (SaaS) schemes particularly. Under the rubric services go mostly (according to the interviewees) integration of systems and maintenance related services. ASP and SaaS, if available, are included. M. Pulkkinen and J. Veijalainen The first issue above is related to the general model of vertical software market evolution (Tyrväinen et al. 2008; see Chapter 4 "Model for Evolution of a Vertical Software Industry" in Part I above), and the second issue is reflected on a common vendor selection criteria classification (Kotler and Keller 2005), which is briefly presented further below. The selection of suppliers is used as complementary information on the software procurement in gauging the status of the market segment. The empirical analysis of these issues follows, reflecting the material from six interviews with European CSP representatives, and from further five interviews with representatives of Asian CSPs, on thes