Charities produce masses of evidence about their effectiveness but we suspect that much of that research is missing, ropey, unclear or you can’t find it. It’s thought that fully 85% of all medical research is wasted in ways like this. This damages beneficiaries in two ways. First, donors and other operational charities can’t reliably get feedback on whether a particular type of work is effective, so may avoidably implement or fund something suboptimal. And second, the research consumes resources which could perhaps be better spent delivering something which does work.