“…(h) To promote the environmental compensation principle in sensitive areas, whenever it translates into services provided by nature conservation selecting outcomes/effects indicators was high, given that a considerable part of the outcomes expected by PROT Algarve are not a direct and immediate result of plan implementation. This was anticipated from the beginning, considering the strategic nature of PROT Algarve, and constitutes one of the difficulties identified in previous works (Therivel et al, 1992;Arts, 1998;Hoch, 2002;Partidário and Arts, 2005). Therefore, only the objectives that the plan identifies in a clear and concise manner were considered to derive indicators (although other objectives could be deduced by interpreting the plan's contents).…”