In traditional process environments, process modeling is performed by process designers and process enacting is performed by process actors. Due to this separation, there is often a gap between process models and their real enactments. As a consequence, the operational level of process environments has stayed low, especially in system and software industry, because they are not directly relevant to process actors’ needs. In order to facilitate the usage of process environments, this paper presents a solution that enables process actors to perform both the modeling and enacting of their real processes. To this end, first, an end-user process modeling approach was proposed to allow each process actor to easily describe the process fragment containing the activities carried out by his role. Second, an artifact-centric process engine was developed to enact activities coming from different process fragments. Our process engine does not require predefined work-sequence relations among these activities to synchronize them, but deduces such dependencies from their exchanged artifacts. As a result, the process engine can enact even a partially defined process where some fragments are missing.