The article includes description of a procedure concerning selection and assessment of factors, which are important for developing usage of renewable energy sources in Poland (worked-out by the author of the article). The procedure consists of the following steps: Step 1: Identification of factors important for developing usage of renewable energy sources and its distribution to thematic groups. Step 2: Preparation of a questionnaire to be used in the research. Step 3: Selection of respondents, who are experts in the field of research. Step 4: Identification of significant stimulators and deterrents of the research's topie. Step 5: Calculation of the factors' hierarchies. Step 6: Experts' recommendations concerning other factors that should be included in further research.