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The quasi-determinism theory discloses the characteristic mechanics of wave groups in wind-generated sea states. These groups have a development stage with a spontaneous focusing of the three-dimensional envelope, being followed by a decay stage with the opposite features. The largest wave height occurs somewhat after the largest crest height, during the evolution of the wave group. Each individual wave has a life cycle, in that it is born at the group's tail and goes to die at the group's head. The theory has received some clear confirmation from small-scale field experiments. All of this is covered by this chapter, which also supplies a FORTRAN subroutine for the calculation of wave group mechanics for a given directional spectrum of the sea state.