The point is that the idea of drawing diagrams instead of writing code (and/or integrating documentation text right into the source code) is a really old idea.

The point is that the idea of drawing diagrams instead of writing code (and/or integrating documentation text right into the source code) is a really old idea. The idea is older than structured programming, older than the C programming language, older than the idea of object-orientation. It's probably even older than McCarthy's LISP. Safe to say that if it hadn't caught on during this time, then it never will.