The diploma thesis deals with the literary texts and their adequacy. It researches what features make kids books appropriate for the development of reading in the fifth grade of primary school. The attention is focused on reader's development and demands of literary texts. The action research gives the overview of one group of readers. Their favourite titles are assesed according to their adequacy. Bonnie Campbell Hill's Developmental Continuums are the main component for defining the criteria of the literary text. The selected texts considered according to their adequacy take place in a suggestion for teachers who want to deal with the level of kids books for their pupils. How to plan and then reflect the pupils reading performance with the knowledge of developmental continuums indicates the practical class.