Real problems in software evolution render impossible a fixed, one-size-fits-all approach, and these problems are usually solved by gluing together various tools and languages. Such ad-hoc integration is cumbersome and costly. With the Rascal meta-programming language the Software Analysis and Transformation research group at CWI explores whether it is feasible to develop an approach that offers all necessary meta-programming and visualization techniques in a completely integrated language environment. We have applied Rascal with success in constructing domain specific languages and experimental refactoring and visualization tools.