We've got "stretch goals" and further reaching criteria that defines even greater success, but these items taken together are necessary and sufficient for our working group's efforts to be considered a success by the group itself.
- We produce a W3C recommendation
 - There is buy in and uptake of the recommendation by browsers, web application developers, web site administrators, and users
 - Capture relevant current best practice
 - There is concensus by the WG that the recommendation is demonstrably better at aiding trust decisions than the state before the wg started