Indicators are measures with associated decision criteria. Decision criteria are defined with threshold values, which are alarms of poor-quality levels. We have defined thresholds by using ROC curves, the Bender method and ATEMA for a group of structural measures and understandability, modifiability and correctness.Correctness: the degree to which a model does not have workflow errors or faults, such as deadlocks. Understandability: attributes of models that have a bearing on the users' effort to recognize the logical concept and its applicability. Modifiability: degree to which a model can be effectively and efficiently modified without introducing defects or degrading existing product quality Authored: Laura Sánchez-González, Félix García, Francisco Ruiz; Last updated: February 2015More Information: University of Castilla-La ManchaAlarcos Research Group: +34 926 295300 ext.96678Ciudad Real - Spain Laura Sánchez-González, Félix García, Francisco Ruiz