Interactions between different language aspects

The paper discusses the interactions between different aspects of linguistic phenomena first distinguished by L.V. Shcherba and elaborated by AA. Zalevskaya. The author gives a definition to the language as the human property and to the other aspects of language. The nature of the interactions between the four aspects of language is analyzed and the assumption is made about the existence of the fifth quasi-aspect, the totality of all the results and data of linguistic and psycholinguistic experiments.