envelopment model ccr in fuzzy mode

To evaluate the performance of decision-making units in data coverage analysis, basic models (coverage, collective, sbm, russell) are used. if a decision-making unit with one of the basic models dea was found to be inefficient, it is definitely an inefficient decision-making unit. in this article, by presenting an algorithm to solve the linear programming problem in a completely fuzzy state, the basic data envelopment analysis models are proposed. using the min-max method to solve the basic dea models in a completely fuzzy state, which turns into a multi-objective planning problem, is very important and avoids the problems of infinity and intractability