Design Once: Use Again and Again and Again…
http://www.stc.org/confproceed/1998/PDFs/00044.PDF

Horton, William K. III
STC Proceedings
1998

Abstract:

You can either do it over and over again; or, you can design it once and use it again and again. The decision to create reusable learning modules need not be an expensive one. It just requires modular design.