In this paper, we propose an architecture of Project- Based Learning Management System (PBLMS). These systems offer learners indicators to support self-regulation in PBL. Indeed, when students are engaged in learning processes with LMS, they are supposed to be autonomous to find information or to organize their activities. Indeed, most of time, few tools are proposed to help them. Our research focuses on the tools which support meta-cognition process to teach learners how to regulate their learning activities during projects. In this paper, we propose a PBLMS architecture that combines together activity traces (which are recorded automatically by the system) and reporting traces (which are reported by learners themselves). This architecture allows learners to build indicators. They can specify the data to take into account and the visualization modes. We present the details of the reporting tool, used to collect reporting traces, which can enhance learners' reflective processes on their own way to learn.