The Workplace Wellness Alliance (the Alliance) was launched by the World Economic Forum in 2009 to address the challenges of data collection and knowledge sharing globally around workplace wellness programmes and the calculation of return on investment (ROI) of such initiatives. Bringing together 150 member organizations from across nine industries, the Alliance has worked with its Leadership Board and select experts to identify key performance indicators, and started the collection of a global baseline of employee health metrics. In 2012, this effort covered almost two million employees across 125 locations.This report presents some of the research and challenges around workplace wellness programme implementation and evaluation as well as results and lessons learned from the Alliance’s data collection to date. It includes nine case studies showcasing different types of ROI perceived by companies around the world, illustrating that return goes beyond mere dollars in dollars out. In 2013, the Alliance will transition to its new home, the Institute of Health and Productivity Management.