This paper reports on usage and impact on learning achievements of a dashboard developed to help monitor self-regulated learning behaviours in an online professional development path. The design of the path as well as of the dashboard were grounded on a pre-existing conceptual framework distinguishing between four different types of self-regulated learning behaviours taking place in professional learning networks and underpinning professional practice sharing. One of the objectives of the path was to promote such behaviours among participants, and the dashboard was designed to support their self-monitoring. Data were collected through usage log files analysis, a survey, and pretest and posttest. The results shed light on participants' actual usage of the dashboard, their opinion regarding its usefulness in relation of its capability to measure and support their SRL processes, and the dashboard's actual impact on their learning achievements. Moreover, some limitations in the current configuration of the dashboard emerged, which can guide further development.