March, & J.P. Olsen (1972) The garbage can process is one in which problems, solutions, and participants move from one choice opportunity to another in such a way that the nature of the choice, the time it takes, and the problems it solves all depend on a relatively complicated intermeshing of elements.
problem or policy streams circumstances Policy Entrepreneur Advocate willing to invest the resources – time, energy, reputation, money – to promote a position in return for anticipated future gain Political Stream