This document summarizes research on workplace flexibility policies and trends. It finds that: 1) The availability of flexibility has increased over time, though use remains lower, varying by factors like industry, occupation, and demographics. 2) Flexibility is associated with benefits like reduced stress and higher engagement for employees, as well as lower turnover and absenteeism for businesses. 3) While the business case for flexibility is strong, further research could help minimize stigma and better quantify the costs and benefits of different organizational approaches to flexibility. 4) It remains unclear what will drive flexibility to become standard practice in more workplaces, whether through policy changes, social pressure, companies acting in self-interest, or