Software engineering methodologies rely on various and complex graphical representations and are more useful when associated to CASE (Computer Aided Software Engineering) tools designed to take care of constraints that have to be respected. Now, CASE tools gave way to CASE environments (a set of tools that have a strong coherence in their us). This concept provides enhanced solutions for software reusability while the environment may be adapted to a specific understanding of a design methodology.This paper describes FrameKit, an Ada based framework dedicated to the quick implementation of CASE environments. We summarize first the concepts implemented in FrameKit and illustrate them using a detailed example of a simple tool implementation and integration.