Will Rev. 5 tranition plan be solely documented in the plan of action and milestones (POA&M) and system security plan (SSP), or is there an expectation of a work breakdown structure (WBS)?

While a WBS is not required, it may be requested by your agency authorizing official (AO). Please confirm your AO's expectations; however, the POA&M should have sufficient detail so that an AO can track the activities and progress made.