Abstract
The purpose of the study is to justify the interpretation, concretisation, and analogy of law as part of the general, private and individual in the law enforcement process. In law enforcement, concretisation is the result and the goal of interpreting legal norms. An analogy in law is the result of interpretative work, based on the impossibility of law to regulate all the nuances of social relations. The subject of the research is the categories of interpretation, concretisation, and analogy in law on their functional purpose. The article analyses the functions and purpose of the interpretation, concretisation, and analogy of law in the methodological aspect, focusing on legal practice. In this article the emphasis is placed on judicial errors arising from a misunderstanding of the judicial interpretation and concretisation of legal norms. The inadmissibility of the wrong interpretation of the rules of law, causing decreasing the effectiveness of legal regulation, is justified.