National audienceThe paper deals with the modelling of Lyee user requirements and guidelines to support their capture. The Sorbonne contribution to the Lyee collaborative project aims to reduce the software development cycle to two explicit steps, requirements engineering and code generation by coupling the code generation features of LyeeALL with an interface to capture user requirements. The paper presents a 2-layer meta-model relating the set of concepts to capture user requirements to the set of concepts for the formulation of software requirements that are the input of the LyeeALL generation mechanism. It exemplifies the concepts with example and introduces the guidance support for capturing these user centric requirements