The Law No. 244/1992 about the evaluation of environmental impact assessment in 14 limited the term conception and general process of evaluation of conceptions from the viewpoint of environmental impacts. The article clarifies methodological directions for evaluation of influences of conceptions on the environment that was elaborated at the Ministry of Environment of CR in 1993, and after its judgement in 1995, the direction utilizable for practice was elaborated. The methodological directive contains steps and criteria for evaluation of conceptions, drafts for elaboration of a review and proceeding of the procedure of conception evaluation by stages.