Clause 6.3 deals with the interested parties. The subject is the involvement of the parties who have an interest in the programme. A programme that meets the clause can name those parties, show how they were involved and record what changed. The clause sits between the owner clause and the scope clause, so the involvement is meant to inform the scope and the criteria that follow.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.