 Structural solutions change the rules of the game either through modifying the social dilemma or removing the dilemma altogether.Field research on conservation behaviour has shown that selective incentives in the form of monetary rewards are effective in decreasing domestic water and electricity use.Furthermore, numerous experimental and case studies show that cooperation is more likely based on a number of factors, including whether or not individuals have the ability to monitor the situation, to punish or "sanction" defectors, if they are legitimized by external political structures to cooperate and self-organize, can communicate with one another and share information, know one another, have effective arenas for conflict resolution, and are managing social and ecological systems that have well-defined boundaries or are easily monitorable.