Our objective is to describe learning scenarios' tracks with its derived data; and, basing indicators' elicitation methodology on these described data. From this viewpoint, our approach presents several interesting points. First, it allows tracks and its derived data description possible by the use of a usage tracking language. Then, it proposes a means of assistance to: (i) teachers in the learning session comprehension and learners' activities evaluation, (ii) pedagogical analysts in tracks' exploitation, and (iii) pedagogical designers in the tracking scenarios? specification by indicators' elicitation. Lastly, it will also allow the development of a tracks based system, which will support this elicitation methodology.