Abstract
During the last two decades the central policy machinery in major parliamentary systems on the British model has undergone a significant evolution. The changes challenge a long trend toward the growing dominance of the public service in the policy process. They in volve attempts by cabinet, under prime ministerial leadership, to increase the policy re sources of the partisan political leadership to facilitate the adjustment of policy outputs to the values of the government of the day. Innovation is creating pressure for change in the system ideology, focusing on the issue of politicization. The persistence of innovations appears to be related to their ability to respond to the requirements of political leadership.

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