Along with the growth of the service sector in the information society, the most rapid growth has occurred in business services, including computer and related services. These high-tech knowledge-intensive business services both produce sector-specific knowledge on new technology and distribute it to other industries of the economy. Thus they are important actors within the wider innovation system. High-tech business service firms operate in rapidly developing 'turbulent' markets, which challenges their ability to adapt to the changes and transform along them. The success of the firms depends to a large extent on their intangible assets, mainly on their human capital. In order to guarantee the innovativeness and competitiveness of their business and the organisational commitment of their employees, it is essential for the firms to pay attention to and invest in the organisation of work and competence. New emerging high-tech business services with increased knowledge intensity of work implicate the changing content of work which both demands and encourages new and varied forms of work organisation. These new forms have not yet been studied much. The focus of this report is on describing the typical organisational features of a specific category of knowledge work, which is information system (IS) expert work in specific a category of knowledge-intensive business services, namely high-tech IT service firms. This report deals with the following questions. How knowledge-intensive is the work in high-tech business services? How flexible, communication-intensive and empowered is the organisation of work in these services? How does the client orientation of services formulate the organisation of work and working in high-tech services? What are the contributions of high-tech business services for the innovation system in the telecommunications sector?