This document discusses policy and systems change. It defines policy as rules that govern organizations and public funds allocated by government. Policy change occurs through new or amended policies. Systems are groups of interrelated elements that form a unified whole, like a food or transportation system. Systems change happens when elements in a system substantially change, altering their relationships and overall structure. Policy change is a key driver of systems change. The document provides examples of public policy changes in different jurisdictions that helped achieve systems changes, like Portland's policies that supported a three-fold increase in bicycling.