Assume that the waterfall model shown in Figure 1 has been derived from the IEEE standard...

Assume that the waterfall model shown in Figure 1 has been derived from the IEEE standard model in Figure 2 during the activity Life Cycle Modeling. What processes and activities have been omitted in the waterfall model?

Figure 1 The waterfall model of software development is an activity-centered view of the software life cycle. Software development activities are performed in sequence (UML activity diagram adapted from [Royce, 1970] using IEEE 1074 names; project management and cross-development processes are omitted).

Figure 2 Process interrelationships in the IEEE 1074 standard (UML activity diagram, adapted from [IEEE Std. 1074-2006]). As suggested by this picture, dependencies among processes and activities are complex and seldom allow a sequential execution of processes.