1) The document discusses personalizing an advanced level business English course book for learners moving from B2 to C1 levels. 2) It provides an overview of a study that surveyed 456 English teachers on the target groups, key skills, and materials needed at the C1 level for business communication. Office staff, managers, and assistants were cited as the main target groups. Speaking freely, reviewing grammar, and building vocabulary were cited as the key skills. 3) The document then describes features of the BASIS FOR BUSINESS C1 course book, which is designed for German learners and uses authentic business situations and materials to teach business communication skills through topics, vocabulary, grammar and discussion.