sentences:  Until the 14th century the book Octoechos, as far as it belonged to the Sticherarion, was ordered according to hymn genre of the repertoire.Later the thematic structure of the "stichera anastasima" which had to be sung during Hesperinos on Saturday and during Orthros on Sunday, were emphasised and ordered according to the eight echoi, each of the eight parts structured according to the order, as they had to be sung during the evening and morning service.They became a well structured book for the daily use of chanters like the later book Anastasimatarion or in Slavonic Voskresnik.