ABOLFAZL KESHVARI - Faculty of mathematics, Iran University of Science and technology, Tehran, iran
MOHSEN AFSHARIAN - Faculty of mathematics, Iran University of Science and technology, Tehran, iran

The free Disposal Hull (FDH) introdaced by Deprins et al. is based on presenting a Production Pssibility Set (PPS) whithout assumption of cinvexity by a MILP model, Deprins et al. proposed an algorithm to solve FDH model without solving a MILP. Their model is a variable returns to scale FDH model. In this paper we introduce constant, non-decreasing and non-increasing FDA model in both LP and MILP forms and extend their algorithm to solve all of these models without solving any LP or MILP models.

Free Disposal Hull 9FDH), Super Efficiency, Convexity