A Dual Path Approach to Developing Documentation
http://www.stc.org/ConfProceed/1994/PDFs/Pg35.pdf

Igel, Victoria E.
STC Proceedings
1994

Abstract:

The document development process is traditionally viewed as a series of steps along a single linear path. Instead, it is useful to view document development as consisting of activities along dual paths: one product-centered and one document-centered. Isolating a product-centered path reveals how much of your time is spent on activities other than writing--for example, learning about the product. It also highlights the ways in which the documentation is dependent on or shaped by the product.