SCOREMATH
Excel function for multi-criteria selection problems
... knowledge to assign exact weight values but they can rank the importance by their expertise or experience. [...] [Our model] requires no pre-defined weight values. At the same time, our model can incorporate some user control by ranking of relative importance of the criteria. [...] decision makers only rank the relative importance of criteria, rather than specifying the degree of relativity. [...] [our model] does not require users with any optimization background."