IntroductionThe Competence Centres have played an important role in the process of knowledge diffusion. It has been observed for example in IT sector. The purpose of this article is to identify the definitions, place and role of CC in IT business ecosystem, in the case of chosen IT leaders and their co-operators, in the area of IT systemic/net products. Critical analysis of literature in the field of studied category is conducted in the article and qualitative method of empirical studies (case study) is applied for practical illustration of described processes and phenomena. In the initial stage of the research promoters of systemic/networking products have been selected, through the review of experiences and using the criterion of their position on the Polish market. They include IBM, Intel, HP, Microsoft and Apple. Then, their network partners, especially distributors, and cooperants outside the network have been determined and sub-networks of partners have been selected. In the period between 2000 and 2015, the Author regularly analysed the content of Internet webpages of selected and authorised press / / sponsored interviews presented in IT magazines, including Computerworld, IT-manager, CIO and another one.1. Competence Centres in holistic knowledge management model. PreambleAccording to one of the first holistic approaches to knowledge management (KM), in Alavi's and Leidner's view, it is defined as systematic and specific process of acquiring, organising and communicating workers' implicit and explicit knowledge in organisational terms. Its purpose is to increase effectiveness of productivity of involved entities, while showing the presence of other entities of the environment in the process in a quite concise way [1999, p. 239]. KM was more broadly perceived by Bounfour who approached - it as a set of procedures, infrastructure, technical and management tools created for the purpose of creating, sharing and expanding knowledge resources inside and outside organisation [2003].A holistic/integral approach to knowledge management is undoubtedly presented in Demerest's model [Demerest 1997, pp. 374-384]. The structure of this model shows not only a scientific expression of knowledge, but also social aspects of knowledge formation. It is not limited to the stage of knowledge externalisation but concerns repeated social interactions. KM ought to be supported by all organisation stakeholders. This, consequently, will be reflected in results of all involved parties. This is about a complementary approach to knowledge management as scientific and social category [McAdam, McCreedy 1999, pp. 91-101].Holistic approach to knowledge management (SET KM Model) is based on three pillars: (1) company strategy, e.g. strategic organisational concept of knowledge and learning, (2) environment of creation, co-sharing and application of knowledge, that depends on the company and objective determinants, (3) knowledge tools favouring the process of effective knowledge management [Choo 1998; Nonaka, Konno 1998, pp. 40-54; von Krogh, Ichijo, Nonaka 2000; Alvarenga Neto 2008].According to Choo's views [1998], the company functioning as knowledgebased is an enterprise that approaches knowledge in strategic dimension (1), through the prism of its significance in a particular context of creation and decision making.The awareness of the importance of knowledge in a definite dynamic and complex environment of company functioning and the ability to search for, and interpret, appropriate information constitutes the strategic goal of the company. It allows understanding of trends and scenarios of the environment, that is made of customers, cooperating parties, competitors and entities. Knowledge creation is a process of forming and/or acquiring knowledge, or information organising and processing for the purpose of generation of new knowledge through dispersion and learning in organisation. …