The third stream is policy stream. It is in the policy stream that the decision agenda or “alternative specification” is formulated. The decision agenda is the list of alternatives from which a public policy may be selected by policymakers to resolve a problem. Here the major forces are not political, but intellectual and personal. Ideas and the role of the “policy entrepreneur,” or the person who holds a deep and long abiding commitment to a particular policy change, are paramount. The major participants in the formulation of the decision agenda are the “hidden cluster.” These include career public administrators, academics, researchers and consultants, congressional staffers, the Office of Management and Budget, and interest groups (interest groups, in Kingdon’s analysis, are significant actors in both the visible and hidden clusters.)