International audienceThe importance gained by process models in modern information systems leaded to the proliferation of process model repositories. Retrieving process models within such repositories is a critical functionality. Recent works propose metrics that rank process models of a repository according to their similarity to a given query. However, these methods sequentially browse all the processes of the repository and compare each one against the query, which is computationally expensive. This paper presents a technique for quickly retrieving process models similar to a given query that relies on an index built on behavioral characteristics of process models