The purpose of this research is to identify the essential success factors in performing "Value Engineering" in Iran. Maurer and Posetas models were used as the basis for success factors identification. These two models have identified 34 variables as effective factors in performing the value engineering Study. Statistical populations of this research were 37 productive and service organizations of Tehran province And statistical samples were, 250 persons who were connected to the subject of value engineering study. Questionnaires-based data were applied for analysis. Statistical method of Binomial test and Factor analysis were applied. 8 key factors from 3 main groups among 34 variable drived from the value engineering methods were used to analysie today conditions of productive and service organization of Tehran province were identified.