From Wikipedia entry on Systematics
Systematics is the name given by John G. Bennett (1897–1974) to a branch of systems science that he developed in the mid-twentieth century. It focuses on types, levels, and degrees of complexity in systems, the qualities emergent at these levels, and the ability to represent and practically deal with ("understand") complexity using abstract models.
Systematics is the understanding of experience by use of number-term systems.
I think that Bennett misunderstood the primary significance of The law of three. I confess this seems like an incredibly arrogant and stupid thing to say in the face of the genius of the man who invented the domain. However in all of his studies of systems with 4 or more terms he never seems to use the triad as a building block. Furthermore I can’t find any references to Koestler’s work on the Holon or to cybernetics, both of which are primary expressions of the Dyad and Triad .
I believe that the triad and in particular the Triholon is the fundamental fractal building block of life.