Lighthouse International publishes scientific-looking research (although most of them appear to be single studies with small sample sizes, so they could stand further vetting). This and this match my experience pretty well, although matching my experience isn’t what I’d call criteria for effectiveness. If nothing else, I expect that they would be the most likely to help me get a quantitative picture of other organizations.
Lighthouse International publishes scientific-looking research (although most of them appear to be single studies with small sample sizes, so they could stand further vetting). This and this match my experience pretty well, although matching my experience isn’t what I’d call criteria for effectiveness. If nothing else, I expect that they would be the most likely to help me get a quantitative picture of other organizations.