Davoud Norouzi Bene - Department of Applied Mathematics, Azarbaijan Shahid Madani University, Tabriz, Iran
Jafar Pourmahmoud - Department of Applied Mathematics, Azarbaijan Shahid Madani University, Tabriz, Iran

The presence of undesirable and non-discretionary factors in general multi-stage systems is one of the challenges of evaluating these systems. This challenge is multiplied when these factors are present in the system at the same time. In this article, a new model is presented for evaluating General multi-stage ‎series systems with these factors. The general idea of this model is ‎how ‎to ‎choose‎ the contraction and expansion parameters, Finally the results are examined with a numerical example

Network Data Envelopment Analysis, ‎Evaluation, Efficiency, Non-discretionary Factors, Undesirable Factors.