This video lecture given by Professor Howard White for the Asian Development Bank (ADB) and the International Initiative for Impact Evaluation (3ie) provides an introduction to the importance of impact evaluation by demonstrating that if we simply measure what happened we won't know if observed changes are because of the actual project being measured.
The video lecture includes a short quiz to help you assess your understanding of the content.
This is lecture one in a six part series that introduce impact evaluations. The other video lectures are as follows:
White, H. (2014). What is impact evaluation? Asian Development Bank (ADB) and the International Initiative for Impact Evaluation (3ie). Retrieved from: http://impactevaluation2014.org/what-is-impact-evaluation/