When is it advisable for an author/creator to register a work with the copyright office?
I work in higher education. Students will sometimes ask for information on copyright protection for a thesis (written, not performance). Sometimes faculty will ask about protecting various devices of education such as a syllabus, exam or spreadsheet.
There are some really good, separate answers to this question. I'll present them in the order I think would be useful to students and academics.
Answer #1: Clarity of ownership