The quality of governance is an issue of increasing concern in countries around the world, both developed and developing. While the evidence suggests governance matters for development, there is less understanding regarding what aspects matter most and how to improve governance. The main problem is the lack of reliable, valid and comparable data on key governance issues. This has left many unanswered questions regarding when, why and how governance makes a difference to the way countries develop. Current indicators also provide inadequate measures for assessing changes and informing strategies to improve governance. The WGA is a global, collaborative effort to improve the assessment and analysis of governance. This work builds on the findings and lessons of a pilot study conducted in 2000-01 by the project team with supported from the United Nations University and United Nations Development Programme.