 This principle makes it, among other things, possible to effectively compare the contributions made by various states, irrespective of the size of their populations.The CPG policy document is regarded as self-contradictory for at least two reasons.Firstly, it identified the two greatest threats to NATO as terrorism and the proliferation of weapons of mass destruction (WMD), whilst simultaneously reaffirming the 1999 Strategic Concept as "remaining valid" despite the fact that it barely mentioned these threats.