To improve the performance of extended enterprises, SMEs must be integrated. This integration must be done on several levels, including the PLM level. PLM is underdeveloped in SMEs mainly because of their difficulties in implementing information systems. This work aims to provide a modelling framework to facilitate the implementation of PLM systems in mechanical SMEs. Our approach offers a generic model for the creation of processes and data models. These models are explained, and then the scope and the improvement they provide are considered.