How do policy makers decide what issues to attend and which choices to make or implement? This question is especially puzzling because policy makers themselves often do not have the requisite information and do not know what they want. They cannot possibly attend to all issues or even educate themselves on what they consider to be the most important problems. Prioritizing issues is a process that contains doses of political power, perception, potency and proximity in different quantities at different times (Zahariadis 2016b, 7-8). It makes the goal of the all-attentive, omniscient, or even satisficing, policymaker largely an idealized myth. In this book, we present and discuss a framework of the policy process, the Multiple Streams Framework (MSF), that provides an answer to the above question by side-stepping this myth (Kingdon 2011;Zahariadis 2003). Exploring systematically MSF's suitability in various issues across subnational, national, and international contexts, we conceptualize public policy somewhat like a Delphic oracle, a process replete with bias, language and symbols among interacting policy actors who generate conflicting messages in staged settings of political power. Drawing on the wisdom and cunning of the ancients, we look for answers in the ritualized context within which issues are raised and decisions are made, stressing two important elements of the process: ambiguity and time (see Zohlnhöfer and Rüb 2016). Ambiguity points to the need to interpret policy facts and time highlights the dynamics of change and shifting priorities. These concepts together help us explain the why and when of public policymaking.Travelling back to Delphic times in ancient Greece, we observe that Pythia, Apollo's priestess, delivered prophecies in a highly ritualized environment