In the introduction the author limits the scope of the concept of Palaeoslavic studies to the analysis of Old Church Slavonic texts of the period of Cyril and Methodius. He includes in this, however, early medieval descriptions of such texts. Other very early Slavonic texts do not belong in Palaeoslavic studies, such as Old Czech texts that are contemporary with the descriptions of texts from the period of Cyril and Methodius. The pace of development in Palaeoslavic studies is connected, as its history indicates, with successive discoveries of manuscripts and their printing. A major discovery, which opened up new scholarly perspectives, was the discovery in Sinai in 1975 of many Old Slavonic texts, written in classic glagolics, including the closing section of the Sinai Psalter containing hitherto unknown canticles from the Old Testament, large extracts from Euchologium Siniaticum, and a missal. The author gives several concrete examples illustrating this. The second important factor is the publication in the last few years of critical editions of many of the oldest descriptions of texts that were written in the period of Cyril and Methodius.