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...Measuring impact evaluation methods for policy makers this material constitutes supporting the in practice book additional is made freely but please acknowledge its use as follows gertler p j martinez s premand rawlings l b and christel m vermeersch ancillary world bank washington dc www worldbank org ieinpractice content of presentation reflects views authors not necessarily those counterfactuals false before after pre post enrolled apples causal oranges inference randomized assignment offering promotion discontinuity design difference differences diff ie matching toolbox score choosing your key information you will need identifying method right program prospective retrospective eligibility rules criteria o poverty targeting geographic roll out plan pipeline number eligible units larger than available budget resources at a given point capacity time constraints excess demand etc...