The IUCN World Conservation Congress has adopted a motion to create a Green List to assess conservation success.
"The Green List will complement the IUCN Red List, which focuses on avoidance of extinction. The Red List has been critical in assessing conservation prioritization and has been a scientifically-rigorous tool highly regarded by governments and other conservation actors. To create the Green List to reach the same level of effectiveness, the motion recommends that IUCN conducts an international scientific consultation process to develop consensus and rigorous criteria."
Via Arno Neumann