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Handoff to engineering will only happen once the PRD is complete. Guidelines for completing the PRD can are here.
Before the PRD can be completed, the following documentation is required. Guidelines have been created for each, to assist you.
User stories - guidelines
Acceptance criteria - guidelines
Test scripts - guidelines
Design document - guidelines
Note that the expectation of quality and thoroughness for each of these documents is much higher than has been the case previouslyto date.
Each should be created to a high standard, and leave little margin for error for the engineers in implementation.