This paper describes a corpus of writing as a process (MUCH), comprising English as a Foreign Language (EFL) student texts. The corpus will contain a large number of richly annotated papers in several versions from students of different performance levels. It will also include peer and instructor feedback, as well as tools for visualising the revision process, and for analysing the writing process and the peer and instructor feedback. MUCH will make it possible to study how texts develop and change in the course of the writing process and how feedback impacts the process.