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In this paper, we propose an indicator-based approach to support teachers' activities. It consists in supplying teachers with indicators which report critical situations or interesting moments about learners' activities. Relying on these indicators teachers can intervene and expect the learner targeted by the intervention reacts through certain actions. However, most of the time, teachers have no information about the effects of their interventions. To overcome this lack, we want to provide them with meta-indicators which follow the evolution of indicator values which allowed to detect the situation at the root of their interventions. Thus, teachers can measure the effectiveness of their interventions in order to quickly react by choosing new remediation strategies, in case of failure.