The classification system of the types of folk tales published by Antti Aarne in 1910 was a much needed and courageous project. Bronislava Kerbelyté has classified more than 40,000 variants of Lithuanian folk tales according to the international catalogue by Antti Aarne and Stith Thompson (AT). She has concluded that it is necessary to improve the classification system. Kerbelyté has determined elementary plots (EP) as structural elements for narratives and created the structural-semantic method for analysis and description of texts on several levels. The classification of elementary plots and their types contains much information about folk tales and about people.