The Handbook on Designing and Implementing RIA Systems (the ‘Handbook’) is intended to assist Commonwealth governments in designing and implementing programs of Regulatory Impact Assessment (RIA) across multiple regulatory institutions. It identifies major risk factors that have led to failure of RIA programs in other countries and suggests options that countries should consider to reduce the risks of failure. It is impossible to reduce risks to zero, but this Handbook will help increase the probability that RIA programs will, in the end, improve the quality of government policies