COMMENSURABILITY Assuming that we have obtained valid A-ROI estimates for multiple investments, there remain issues to be considered and addressed when using those results for investment comparisons and decisions. The issues center on the extent to which those different A-ROI estimates can be compared to gauge relative cost-effectiveness and, if the answer is yes, how to compare them properly. First, there is the issue of different outcome measures. For example, A-ROI is calculated for three investments that are intended to increase reading achievement, reduce suspension, and improve sense of belonging, respectively. It is apparently inappropriate to compare the results directly […]