Multicriteria scheduling of a railway renewal program

Quite often nowadays, Project Scheduling has to be studied as a multicriteria decision problem, whereas previously more traditional techniques, developed to minimize project duration, had been used. In this paper, the scheduling of projects within a large railway renewal program in northern Portugal is studied adopting a formulation based on three major criteria. This model (Trident), described and used here, has been developed by the author to aid in three-dimensional decision problems.