Root Cause Tree Diagram

Key responsibility roles:
(1) Responsible.
Those who do the work to achieve the task. There is at least one role with a participation type of responsible, although others can be delegated to assist in the work required.
(2) Accountable (also approver or final approving authority).
The one ultimately answerable for the correct and thorough completion of the deliverable or task, and the one who delegates the work to those responsible. In other words, an accountable must sign off (approve) on work that responsible provides. There must be only one accountable specified for each task or deliverable.
(3) Consulted (sometimes counsel).
Those whose opinions are sought, typically subject matter experts; and with whom there is two-way communication.
(4) Informed.
Those who are kept up-to-date on progress, often only on completion of the task or deliverable; and with whom there is just one-way communication. [Responsibility assignment matrix. Wikipedia]
The involvement matrix example "Sale problem solution" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the solution "Seven Management and Planning Tools" from the Management area of ConceptDraw Solution Park.