Small is beautiful? A recent evaluation of a major UK government funded Community Driven Reconstruction Program in the Democratic Republic of Congo had the biggest sample ever: 1.8 million people in the treatment group. That is mind-boggling, even in a developed country. But a small sample size can also yield useful results.
Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them says Owen Barder in his excellent series of blogs on complexity and development
Management matters, a lot
Dilemmas. With £500 you can hire a £50,000 car but with £1 you cannot hire a £50 car seat.
Just when you thought that you survey questionnaire is fool proof, a magician can always do better