This manual provides an overview of core statistical and econometric methods for program impact evaluation (and, more generally, causal modelling). More detailed and advanced than typical brief reviews of the subject, it also strives to be more approachable to a wider range of readers than the advanced theoretical literature on program impact evaluation estimators. It thus forms a bridge between more basic treatments of the essentials of impact evaluation methods and the more advanced discussions. It seeks to discuss impact evaluation estimators in a thorough manner that does justice to their complexity, but in a fashion that is approachable.