Software editors, integrators/resellers, audit firms on business processes... Facing with a large number of players of all kinds, how can you find the right way to implement a software solution for the management of your company? Once you've selected a few solutions, should you opt for a customized project approach or should you focus on respecting the standard as much as possible? Big bang or progressive deployment? This presentation will focus on providing you with the main concepts and basic considerations in order to carefully approach the implementation of an ERP, a critical step in the life of a company.