Describe the Separate streams of problems and policies

The separate streams of problems, policies, and politics each have lives of their own.

• Problems are recognized and defined according to processes that are different from the ways in which policies are formulated and political events unfold.
• Policy alternatives are developed according to their own criteria of selection, whether or not they are solutions to recognized problems or sensitive to political considerations.
• Political events flow along on their own often unpredictable schedule, whether or not they are related to problems or policy proposals.