In decision theory, the weighted sum model (WSM), also called weighted linear combination (WLC) or simple additive weighting (SAW), is the best known and simplest multi-criteria decision analysis (MCDA) / multi-criteria decision making method for evaluating a number of alternatives in terms of a number of decision criteria.
It is very important to state here that it is applicable only when all the data are expressed in exactly the same unit. If this is not the case, then the final result is equivalent to “adding apples and oranges.”
^ Fishburn, P.C. (1967). “Additive Utilities with Incomplete Product Set: Applications to Priorities and Assignments”. Journal of the Operations Research Society of America (ORSA), Baltimore, MD, U.S.A.
^ Jump up to:a b Triantaphyllou, E. (2000). Multi-Criteria Decision Making: A Comparative Study. Dordrecht, The Netherlands: Kluwer Academic Publishers (now Springer). p. 320. ISBN 0-7923-6607-7.
^ Malczewski, Jacek; Rinner, Claus (2015). Multicriteria Decision Analysis in Geographic Information Science. New York (USA), Heidelberg (Germany), Dordrecht (The Netherlands), London (UK): Springer. doi:10.1007/978-3-540-74757-4. ISBN 978-3-540-86875-0. Retrieved May 31, 2020.
^ Churchman, Charles W.; Ackoff, Russell L.; Smith, Nicolas M. (1954). “An approximate measure of value”. Journal of the Operations Research Society of America (ORSA). 2 (2): 172–187. doi:10.1287/opre.2.2.172. Retrieved May 31, 2020.