This is Amadou Binta Ba, from Senegal, again (Message 13). 

Thanks to Peter Midmore for your contribution (Message 20), you are raising very important issues. As far as I am concerned I don't have experience about evaluation because I am a beginner. But I have some concern about this issue regarding my study. During an interview with local community leaders of my study area I have been told that the project had an effect beyond the target villages. It impacted some neighboring villages because of their position. I think that failure to take into account this type of selection bias can affect the results. This is one of the reason that I need to learn more about the methods and the project as well in order to have a valid control group and to avoid selection bias.

Amadou Binta BA
PhD student in Climate Change Economics
BP: 5683 
Faculte des Sciences Economiques et de la Gestion (FASEG)
Cheikh Anta Diop University
Dakar-Fann 
Senegal

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