Builds on the work of David Easton whoconceptualizes the political system involving the authoritative allocation ofvalues to society. Public policy then isseen as an output of the political systems. Insofar as all the elements of the “system” are all (by definition)interrelated, it responds to the public’s supports and demands (the publicbeing part of the environment) as inputs with appropriate decisions, actions,policies, and programs as outputs. These, in turn, are evaluated and returned to the system in the form ofadditional demands/ support. This demand-responsecycle is in keeping with the logic of systems theory – the idea thatresponsiveness is the key to how a system preserves itself.