This article discusses epistemological and methodological problems brought forth during the study of management practices in companies and organisations based on an ethnomethodological approach. Ethnomethodological issues and knowledge in organaisation management and the complexity of the involvement of the researcher will be discussed by way of analysis of six controversial reports on the involvement of the researcher. Our aim is to clarify the nature of the work carried out by the researcher. Therefore the questions of the neutrality of the researchers (...) and the dialectical immersion-distancing with regards to the objects being studied will be discussed. The aim of this article is to show the theoretical and epistemological interest of the organisation ethnomethodology in a constructivist perspective with regards to management sciences research. (shrink)