This document discusses the need for improving the use of evidence in developing policy in developing countries. It outlines 3ie's goal of supporting better evidence to improve lives. While evaluation is commonly used in other fields like engineering, policy evaluation in areas like education and poverty alleviation is rare. Results are difficult to measure and take a long time to be observed. Politicians and evaluators often have different incentives, with politicians wanting quick results and evaluators wanting rigorous research. Ways to better align these groups include incentivizing implementation of strategies, quicker dissemination of results, and institutionalizing evaluation practice beyond political cycles.