Shouldn't it have been adapted or developed by? Especially considering it was a direct adaptation (https://www.imdb.com/title/tt0084973/) of a Fawlty Towers script. It doesn't show the full credits at the end, but on the Snavley (https://www.imdb.com/title/tt0777277/) one it did say based upon Fawlty Towers by John Cleese and Connie Booth. All In The Family was credited as being "developed by Norman Lear and Bud Yorkin" not created by them since they were adapting an already created show.

Is it true that it was because John Cleese was so appalled by the adaptation — mostly that they made Basil and Sybil one person in the form of Bea Arthur — that he wanted no credit and pulled his name off it?