Critical. (Note that documentation can be electronic, not 
necessarily paper, may be embedded in code comments, etc.) 
QA practices should be documented such that they are 
repeatable. Specifications, designs, business rules, 
inspection reports, configurations, code changes, test 
plans, test cases, bug reports, user manuals, etc. should 
all be documented in some form. There should ideally be a 
system for easily finding and obtaining information and 
determining what documentation will have a particular piece 
of information. Change management for documentation should 
be used if possible.