Integrating performance modeling in the software development process

We discuss the integration of performance modeling and analysis in the software development process. Various approaches have been recently defined to integrate performance models and specification languages and models to derive or validate non-functional properties of a software system. Such integration of quantitative performance analysis should provide feedback easily understandable by the software designer and system developers. A framework that allows the combination of different performance modeling techniques and methods, defined at different levels of abstraction, should better support performance analysis and validation of complex and heterogeneous software systems during the software development process.