From Online Document to Electronic Performance Support System 
This demonstration introduces the concept of an Electronic Performance Support System (EPSS), an online end-user support system that provides whatever is necessary to generate performance and learning at the moment of need. The speaker will step through a five-level analysis of the design and delivery components of an EPSS and demonstrate how to design and position online documents for inclusion in an EPSS.
Hyman, Francine N. STC Proceedings (1994). Articles>Documentation>EPSS>Online