Flow through effects have not been completely ignored by GiveWell. But their comments on it are much less rigorous and careful than their other work:
http://www.jefftk.com/p/flow-through-effects-conversation
http://blog.givewell.org/2013/05/15/flow-through-effects/
Flow through effects have not been completely ignored by GiveWell. But their comments on it are much less rigorous and careful than their other work:
http://www.jefftk.com/p/flow-through-effects-conversation
http://blog.givewell.org/2013/05/15/flow-through-effects/