As economies move into the information age and post-industrial era, information and knowledge become important, if not the most important, resources to organisations. Knowledge is widely recognised as being the key asset of enterprises. The article discusses the role and contribution of Business Process Modelling in the Knowledge Management initiative and in the management of company specific knowledge. Business Process Modelling is an important tool for Knowledge Management that allows the transformation of informal knowledge into formal knowledge and facilitates its externalisation and sharing. The article emphasises an important differentiation between various categories of knowledge, identified in the BPM process, as a basis for the business process related knowledge categorisation and identification of key knowledge processes. The article also presents the theoretical framework, which gives an account of how business process models capture and allow the sharing of the knowledge. The framework identifies key a) knowledge categories, b) stages in knowledge transformation and c) activities in this process.