Competitiveness led factories, today, to be much more careful with their product development process, more accurate with their human resources and involve a diversity of actors such as operators, technicians, engineers, etc. creating heterogeneous knowledge domains. In this paper, we aim to present a comprehensive explanation of an approach regarding knowledge extraction and structuring in the factory. We begin our paper with an overview about the context of our research proposal. Then, we explain different constraints to take into account during the process of building our model.