  In this document we share the experiences gained throughout the development
of a metro system case study. The model is constructed in Event-B using its
respective tool set, the Rodin platform. Starting from requirements, adding
more details to the model in a stepwise manner through refinement, we identify
some keys points and available plugins necessary for modelling large systems
(requirement engineering, decomposition, generic instantiation, among others),
which ones are lacking plus strengths and weaknesses of the tool.
