Evaluation of the cycle and planning for the next
phases: understand the revision of the previous stages and
the planning of the next phase. Depending on the results
obtained in the previous Stages (decisions, analysis of
risks and verification) the development could proceed in a
Waterfall (linear) model or on a Evolutionary model. For
instance, if the first cycle is already done, and the
requirements are completely specified and validated, the
Waterfall model could be chosen. Otherwise, it might be
necessary to construct new prototypes, improving them,
evaluate new risks and re-plan the project, following an
Evolutionary model.