Public policy is now an autonomous discipline, with its own vocabulary, dimensions and analytical categories. But it cannot avoid to interact with other academic disciplines and very often Public Policy borrows concepts or framework from the “mother-disciplines” or the “older sisters” or develops a multi-disciplinary approach. Since the foundation, public policy has grown up by focusing around the following dimensions: the policy orientation (politics is not just about elections, political parties, and public institutions’ behaviour) the attention to policy dynamics (the process can make the difference); the craft of problem solving.