Six Sigma: What is a BRD (Business Requirements Document) ?

Excerpts from an article:
Business Requirements Document: A High-level Review (J. DeLayne Stroud)

The BRD is important because it is the foundation for all subsequent project deliverables, describing what inputs and outputs are associated with each process function.

The BRD distinguishes between the business solution and the technical solution. When examining the business solution the BRD should answer the question, “What does the business want to do?” For example, the business wants to serve 100 bottles of red wine each night during a three-day conference and the wine must be 57 degrees Fahrenheit when poured. The technical solution should support the business solution. For example, the company would need a wine grotto or refrigeration storage unit capable of holding 300+ bottles operating between 48 and 52 degrees Fahrenheit.

Prerequisite one for a BRD is the project charter, created during the define phase ...
Prerequisite two is a current environment assessment created during the measure phase ...
Prerequisite three is CTQs, identified in either the define or measure phases ...
Prerequisite four is the target environment assessment, created in the measure phase ...

Links:
http://www.isixsigma.com/implementation/project-selection-tracking/business-requirements-document-high-level-review/