On a recent trip to the US, I noticed that the discussions around ‘Pay for Success’ were a little different to those I’d been having on ‘Social Impact Bonds (SIBs)’ with other countries. Particularly in the measurement community, there was an idea that Pay for Success took measurement of social programs to a new level: that ‘Pay for Success’ meant paying for an effect size (by comparison to a control group), rather than ‘Pay for Performance’ which paid for the number of times something occurred. Continue reading →