Policymakers are often confronted with problems that involve ambiguity and uncertainty (Zahariadis, 2003). In order to make sense of such problems and to identify possible solutions, they are on the lookout for policy ideas. Those are defined as general information, scientific or expert knowledge, cognitive frames, representations and moral values used by various stakeholders in order to justify collective choices for public policies. More specifically, they help those stakeholders to analyse and identify policy problems and define policy solutions that can be incorporated in the public agenda (Nay, 2012). To date, scholars have had a number of takes on how policy ideas are generated and delivered to policymakers. For example, Kingdon's (1984) Multiple Streams approach explains how and why some ideas move onto the policy-making agenda, while others do not. The extensive agenda-setting literature addresses the question of the saliency of policy ideas -that is, why some ideas are important and others not -and how varying levels of salience shape the public agenda (see, for example, McCombs and Shaw, 1972). And, policy communities' studies explored the question of idea generation and delivery through means of stable networks of policymakers, interest groups and experts (see, for example, Rhodes, 1986).Two books make interesting contributions to this scholarly debate. They focus on knowledge regimes and framing as two ways in which policy ideas can be generated and delivered to policymakers. Jointly, these books advance research on policy ideas by addressing questions about: Where do ideas come from? How do ideas change? And how do these patterns vary across different policy arenas? The authors do not