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The Nask Bayān, once part of the so called Greater (Sasanian) Avesta, but now lost, became a central issue of discussion in the Avestan Studies over the last 15 years. These discussions tried to clarify its relation to the collection of the Yašts (and to the Xorde Avesta) and to reconstruct types of a liturgical celebration of this Bayān Nask or of parts of it. The following article gives an overview on the recent research. It gives also some new suggestions concerning the structure of the collection of the Yašts.