“…As a consequence, these work mainly deal with variability by evolution, at run-time. On the other hand, several version-based meta-models for capturing process changes have been proposed in the literature (Kradofler and Geppert, 1999), (Zhao and Liu, 2007), (Chaâbane et al, 2010), (Chaâbane et al, 2011). For instance (Zhao and Liu, 2007) proposed to model versions of processes as direct graphs named VPG (Version Preserving directed Graph).…”