Someone who has seen a lot of movies but has never made one has a certain kind of knowledge. The same is true for clients, patients and students. They haven’t solved a problem, healed a patient or taught a class, but they’ve seen it done.
They might have something helpful to add. Or they might not.
PS thanks to James Hunt for creating and maintaining THIS IS BROKEN, a directory of the 491 books I’ve recommended on this blog over the years.
The site inspired my podcast page as well.