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Effectiveness, refers to the extent to which goals are reachedEfficiency, measures the cost up against the gains obtainedEquity, refers to the distribution of costs and benefitsCo-benefits is where other benefits are produced out of the same goal, e.g. in additionto store carbon REDD could preserve biodiversity, improve livelihoods and preventpoverty.Or as presented by Angelsen: “Is the mechanism achieving its GHG emission targets(effectiveness)? Is this target achieved at the minimum cost (efficiency)? What are thedistributional implications and co-benefits (equity and co-benefits)?”(Angelsen 2008,p.18.)Whether the different actors involved will deem the regime a success or a failure, itcould result in a response where the institutional arrangement is changed (Bromley1989), thus having an effect on both the resource and its attributes as well as people‟sperceptions. Here we also see how the attributes of the resources correspondinglyaffect the outcome itself. Accordingly, the present arrangement of property rights andregimes that defines costs and benefits may be understood as a result of previouslyevaluated outcomes. However this change in regimes and institutions depends onpolitical priorities and on existing power relations and rights previously explained. Inthe case of Tanzania, the natural resource sector has experienced several shifts inpolicies, institutions and structures up to today. It is this foundation which lies in frontof a future REDD regime where its outcome deeply depends on political priorities,existing power relations, and established rights.30