In light of this, the question that animates this book is as important as it is simple. Can post-crisis inquiries deliver effective lesson-learning which will reduce our vulnerability to future threats? Conventional wisdom suggests that the answer to this question should be an emphatic no. Outside of the academy, for example, inquiries are regularly vilified as costly wastes of time that illuminate very little while inside social scientists echo similar concerns, regularly describing inquiries as unhelpful. These commentaries, however, lack robust, generalizable evidence to support their claims. This volume provides evidence from the first international comparison of post-crisis inquiries in Australia, Canada, New Zealand, and the United Kingdom, which shows that, contrary to conventional wisdom, the post-crisis inquiry is an effective means of policy learning after crises and that they consistently encourage policy reforms that enhance our resilience to future threats.