Agile methods are the response to turbulent software devel- opment environments and requirements de¯nitions di®ers in these meth- ods from what is done in others. The purpose of this paper is to classify these former methods to measure their impact on requirement engineer- ing processes. The approach used in this research has several purposes, the ¯rst one is to build a framework to classify and compare the methods. The second is to propose a component based approach to bring agility to other methods.