Łukasz Widła-Domaradzki is an expert in the field of evaluation studies especially interested in statistics and quantitative methods with almost 20 years of experience. He is coauthor of Stratified Propensity Score Matching method. For 16 years he has worked in market and social research companies (Millward Brown SMG/KRC, Ipsos Poland), in private sector (ICF International) and Polish governmental agencies (Polish Agency for Enterprise Development). For several years associated with the evaluation of the EU funds. Fluent in statistical software, using especially SPSS, Stata, R or SAS. He is also familiar with software for structural equation modelling (SEM) and PLS. He has been working for various clients, ranging from market research carried out for HBO, Orange and T-mobile where he support behavioral projects, as well as for customers in the public administration sector. He take part in numerous research projects as an expert for statistical analysis. Recently he was involved in assessing the impact of development projects in Kenya where he was working as a qualitative method expert. Łukasz is also co-author of an academic textbook and lecturer.