Programming By Example or Programming By Demonstration

A technique called Programming by Example have been introduced in a program named Pygmalion. The designer, Smith elaborated PBE in the first chapter of a book entitled "Watch What I Do: Programming by Demonstration". The technique emphasize the need to describe algorithms through concrete examples rather than abstractly.

Here are some captions on somebody ideas of Smith's PBE. He also wrote on drag and drop programming which I think is just the matter of how you do it not really on how you think on doing it. He is Peter Hale by the way.