The concept of the principle of parties’ assistance
The paper studies the notion of the principle of cooperation of the parties obligations. A comparative analysis of understanding of the discussed principle in Soviet and modern legal literature. Critically analyzing different points of view, the author formulates the distinctive features of the mentioned effects leads him definition. Describes the main aspects of the differentiation of the concepts "cooperation" and "cooperation". It is noted that at present the principle of promotion are not fully determines the system of contract law in Russia.