Szukana fraza: [Abstract = "The central problem of development psychology, and psychology in general, is a way of dividing of life into periods called in European tradition as a periodization of ontogenesis. Nor just the division of life into separate periods, but the creation of a theory that would explain why the individual life is divided into periods in a certain way. Only with such a theory, it is possible to wonder about the age periods and the duration of their borders. The solution of second problem appears as an objective of this article."]

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