A Case Study in Modular Documentation 
Modular documentation is a variation on single-sourcing methodology developed by Interim Technology Consulting in response to a client’s needs. Our client needed documentation on multiple formats that could be easily modified for multiple customers of their customized software package. The process of developing the modular methodology required considerations such as how to define, structure, and access the information modules in a way that worked for the current project and also provided a foundation for future projects. Interim Technology also wanted a methodology we could use for other clients.
Johnson, Melanie M. STC Proceedings (2000). Articles>Content Management>Single Sourcing