The paper discusses the use of evaluation criteria for the positive legal regulation of family relations in the textbook D. Hrabar et al., Obiteljsko pravo, Narodne novine, Zagreb, 2021. The first part of the paper describes the research problem, states the research aims, describes the method of qualitative content analysis, and elaborates on the themes, categories and subcategories used. The second part determines which evaluation criteria were used in the textbook, their frequency of use, and whether the evaluation criteria were explicitly determined in the textbook. Secondly, it determines the ratio of internal and external evaluation criteria and in what percentage evaluation of law has been followed by the recommendation for its improvement. The conclusion consists of the discussion of research results, and the importance of the conducted research in the field of the methodology of legal science. The results of the research showed that nine internal and ten external evaluation criteria were used for the evaluation of the positive legal regulation of family relations in the textbook. Internal criteria were predominantly used for law evaluation. Furthermore, the research showed that internal criteria were most often implicitly applied in the textbook, while external criteria were most often explicitly applied. Finally, research results have showed that a lower number of recommendations for improving law follow its evaluation.