Excel function for multi-criteria selection problems
SCOREMATH implements the simple-yet-ingenious weighted linear model for multi-criteria selection problems described in Ng, Wan Lung. "An efficient and simple model for multiple criteria supplier selection problem." European Journal of Operational Research 186, no. 3 (2008): 1059-1067.
"There are many real situations where the decision makers are able to tell the criteria importance ranking (although they cannot tell the exact values of weights).