The role of Information Systems in modern organizations is constantly growing. They become today an essential component of their competitiveness. But, the software industry isn't mature and still in crisis. Certainly, all solutions proposed nowadays contribute in a large part to improve the software's development process productivity and products quality, but they are not sufficient, partly because they ignore some aspects of the software. In this paper, we propose a three layers software development method which takes into account aspects of software that are not always considered. This methodology is based on ten software dimensions and relies on three processes: organizational engineering, software engineering and architecture definition.