“…The planning approach is the most used solution in the research literature (Rocha & Oliveira, 1999;Petersen, 2003;etc. ), including its hierarchical variant (Ouzounis, 2001), since it is easier to implement and allows greater control over the resulting DVO. The button-up approach (Rabelo et al, 2000), in turn, leads to forms of Dynamic VOs more efficient and agile, but its control is often far more complex.…”