To implement a document management system in a firm : In this digital age, document management is a major issue in the corporate world, where firms have to deal with increasing number of new softwares and management theories. Through a study case, this report wants to show the similitaries between Enterprise Document Management and Knowledge Management. In light of this project - to implement a document management system - we will understand how Enterprise Content Management play a part in a Knowledge Management project. Firstly, we will have a close look at the firm, who is the main subject of this study, and her way of functioning through its history. Then, we will define some concepts and tools in order to show that a parallel can be draw between Enterprise Content Management and Knowledge Management. Finally, we will develop a general study about solutions, and about some questions in relation to document management. Keywords : Enterprise Content Management, Electronic Document Management, Electronic Content Management, Knowledge Management, document management.