CRITERIA METRICS
Numerical scales. This rating problem can be overcome by establishing a numerical scale and assigning locations on the scale to excellent, adequate, and poor..
End points. Establish the end points of the criteria metrics that map into the end points of the common scale. This may not be as easy as it sounds, but once the end points have been established, we can assume that equally spaced intermediate values match up with the equally spaced increments on the common scale..
Weighting Factors. The simplest approach is to assign numerical weights to each criterion to indicate its importance relative to all other criteria. Ideally these weights will reflect your client's judgment of relative importance.