Estimated concepts are the typical signs of certain law significant phenomena of a concept of the law which are in details not regulated by the legislator and generalizing in themselves which specification is carried out by assessment within a specific law-enforcement situation. As a result - estimated concepts are indistinct by the logical nature, have no rather clear content, and serve only as a form of typification of any significant signs or circumstances. At the same time, their application is inevitable in the legislation, but conceals in itself a number of dangers and complicates interpretation of the law.Estimated concepts and categories are used by the legislator at impossibility of detailed settlement of a number of similar circumstances, and also serve for designating the abstract legal phenomena which maintenance has not closed structure. Always remaining opened, it can be established only by means of independent assessment of a specific law-enforcement situation from the person applying the law.Explanation of maintenance of an estimated concept is reached by establishment of its standard. To find the standard, a sample, a standard of an estimated concept - business the difficult, demanding skills interpretation and interpretations of the law from the law enforcement official as this sample directly is not enshrined in the law, and contains in ethical standards, moral values, and sense of justice of people. The specification of estimated categories in legal proceedings is directly connected with a judicial discretion.