Its clear so far that the general option is that all documents are important
to the overall validation process, but the URS as an individual document seems like the
clear winner. We have to agree with this at askaboutvalidation if the URS is not in a good
state then the overall validation life cycle can suffer.
Click here
http://www.askaboutvalidation.com/what-is-the-most-important-validation-document/
to view the poll.