English summary: When 'Der Unterricht der Visitatoren (Instruction for Visitors)' was published in Wittenberg in March 1528 it constituted a compendium to initiate the reformation. Readers could now inform themselves of the reformational process of the church in the electorate of Saxony. John, Elector of Saxony arranged that Philip Melanchthon composed this text together with administrative lawyers, and that among others Martin Luther revised it...