The Constant Design Balance
http://www.apogeehk.com/articles/constant_design_balance.html

Szuc, Daniel and Gerry Gaffney
Apogee
2005

Abstract:

Usability is about understanding your users, and designing and testing with and for those users. However, there are other competing needs that need to be considered to ensure product success. In architectural and technical drawings, different layers or transparencies are often overlaid to assemble the complete design solution. A similar "design transparency" approach can ensure that product teams are working towards a common goal, gaining a balanced view, and increasing the chance of success.