Filtering vs weighting
I am selecting a CRM package for a bank. I asked my colleagues how they’d gone about it, and got 8 responses. Every single one of them had the same weighting approach: Take a huge list of criteria, assign weights, score each package, calculate a weighted-average score, pick the highest one. As I mentioned earlier, I think weighting is a lousy method. (See Errors in multicriteria decision making.) You can’t say “I picked this package because it has X, Y and Z features, which the others don’t.” You can only say, “Oh, overall, it has the highest score…” ...