Within the policy stream of Multiple Streams Analysis there are series of “criteria” by which proposed policies will be judged. (Effectiveness is not necessarily high on the list, if you will allow me a moment’s cynicism).
One is value acceptability – does it mesh with the professed aims and “party ideology” (an element of the politics stream).
See also instrument constituencies, policy entrepreneurs and so on – EDF’s role in the US in championing market mechanisms for ‘protecting’ nature (as a way of distinguishing itself)
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