You want your software project development to be successful ? Our experience in project management show us that most of failed projects had a bad scope definition. GPDef is a result of 20 years experience in project management using well-known methodologies mixed with our own way to define and understand project definition. This tool assists you in editing system requirement to drive your sofware development project to success. Through 10 steps, GPDef helps you to cope with a wide set of issues related to any software development. GPDef is designed to allow several people to work together on a shared project at any time and any step. The global and detailed system requirement released will allow any professional developer to bring the right answers to your needs.