[HelloNurse]

> We assume that CMM tool only provide the technical basis for a good documentation but how well it is used depends on the developer

This comment exemplifies an important potential source of bias in your future analysis: judging how well practices are applied, which is neither objective, feasible, or relevant. Someone's use of a practice shouldn't be considered more (or less) agile on the basis of their success, and you also lack clear measures of success to begin with.