Models have become essential for supporting the development, analysis and e- lution of large-scale and complex IT systems. Models allow di?erent views, p- spectives and elements of a system to be captured rigorously and precisely, thus allowing automated tools to manipulate and manage the models. In a full-?edged model-driven engineering (MDE) process, the transformations developed and - pressed between models are also key. Model transformations allow the de?nition and implementation of the operations on models, and also provide a chain that enables the automated development of a system from...