Details about the history, organisation and coherence of the cycle were only elucidated in the second half of the 20th century, by scholars such as Alfred Dürr.Dürr, Alfred 2(1976). Zur Chronologie der Leipziger Vokalwerke J. S. Bachs, 2. Auflage: Mit Anmerkungen und Nachträgen versehener Nachdruck aus Bach-Jahrbuch 1957. Kassel. p. 16 According to this research the chronology of the first six chorale cantatas Bach presented in 1724 is updated as follows (K numbers of the first edition of the chronological Zwang catalogue are given between brackets):Günther Zedler. Die Kantaten von Johann Sebastian Bach: Eine Einführung in die Werkgattung. Books on Demand, 2011. , p. 32Philippe (and Gérard) Zwang. Guide pratique des cantates de Bach. Paris, 1982. Johann Sebastian Bach: Correspondance Catalogues Zwang — Schmieder at
