%0 Journal Article %T - %J Journal of Economic Research (Tahghighat- E- Eghtesadi) %I University of Tehran %Z 0039-8969 %D 2004 %\ 12/21/2004 %V 39 %N 4 %P - %! - %K Huang and Liu Model %K Parametric and Non-Parametric Approach %K Production Function %K stochastic frontier %R %X This study compares parametric and non-parametric approaches for the efficiency and scale economics of range management projects in 3 provinces. The DEA results indicate that: 1- There is a potential to raise technical-efficiency 33% in range. management projects; 2- Increasing return - to - scale(IRTS) is prevalent in production process; 3- Ordering the provinces according to the level of technical efficiency position khorasan, west-Azarbaijan, Yazd in the first, second and third place. 4 The feeling of possession and local methods of management and division of range land has a positive impact on the sustainability of pasture landS'. 5- The increasing number of livestock and livestock operators lead to a decline in the biologic capacity of pasture lands. 6- Extension trainings are successful for increasing of efficiency. The comparative study of approaches show: 1- Both have their specific potential; 2There is the possibility of contradictory results; 3- The application of the results of parametric approach in non-parametric approach modeling reduce the possible deficiencies of the latter; 4- The application of parametric approach in the agricultural and natural resource researches is very essential because of their characteristics; 5- The average efficiency in DEA- VRS is likely higher comparing to SF A in Agricultural and natural resource section. JEL Classification: Q12,R29. %U https://jte.ut.ac.ir/article_11475_76bc1bf454050ef78eb2a83ed3f758d2.pdf