**7. Summary and outlook**

In order to respond negative accusations and allegations that the OPP in Indonesia is not environmentally friendly, unsustainable and destroy forests and peat-lands, Indonesia should have an evaluation system that is based on a scientific approach. In order to achieve this aims, concrete efforts are needed in the form of a system supported by tools that can be used to evaluate the effects of OPP in Indonesia objectively, rationally, scientifically, measurably, proportionally, quantitatively and accurately to the quality of S-L-E in Indonesia which can also be used to increase productivity and to help design management to prevent S-L-E degradation. The evaluation system needs to be supported by the Plant Potential Productivity Index (PPPI), Soil Quality Index (SQI), Land Quality Index (LQI) and Environmental Quality Index (EQI). By having the evaluation system, the effect of OPP on the natural resources and environment can be determined, whether OPP produces degradation or improvement on certain area as well as for a national scale.

*Necessity, Principle and Technique of Evaluation Model to Assess Sustainability of Oil Palm… DOI: http://dx.doi.org/10.5772/intechopen.98585*
