There might be a problem in taking it too literally, but I think the underlying concept is very current, and maybe even more important than when the book was written: as much as possible, favor keeping a written trace and avoid disruptions to others.
To the written note: I think that really depends on workplace culture and communication content. I see it as e-mail for printed documents. For instance, in my workplace, it is quite common to exchange printouts of scientific articles that way, with a post it "you might find this interesting".
To the written note: I think that really depends on workplace culture and communication content. I see it as e-mail for printed documents. For instance, in my workplace, it is quite common to exchange printouts of scientific articles that way, with a post it "you might find this interesting".