Even though it is an attractive strategy, Mass customization (MC) is not feasible in all environments, and when it is, it presents many challenges to be dealt with. Therefore, an extensive study on how to implement MC is needed before the actual implementation. In this article a literature review is done to define how MC can be efficiently implemented and evaluated. Starting by defining the level of customization, then adapting the entire company to the desired MC strategy to finally evaluate it. Also it presents DOROTHY which is a European project that aims to design tools and methods for implementing MC in the footwear industry.