Chapter 5 recognizes the TCTP as an important aspect of construction project management subject to the project’s fixed budget/deadline or to obtain minimum cost/duration for the project. It, in its continuous or discrete variants, generally deals with the deterministic or non-deterministic mathematical, heuristics, and metaheuristics approaches. Stochastic, fuzzy, and robust optimizations are the modeling approaches that are widely used in the background of the concept. Accordingly, this chapter reviews the literature of the concept and provides some potential directions for future research.