How many people should be accountable for a process as defined in the RACI model?

Having as many accountable people as necessary violates the core RACI principle that accountability must be singular to prevent diffused ownership and unclear escalation paths.

In the RACI model, 'A' stands for Accountable and represents the single individual who owns the outcome and has ultimate authority - in ITIL this is the process owner. Having only one accountable person is a fundamental RACI rule; if two people are accountable, neither is truly responsible for the outcome. The process owner signs off on process quality and is the single point of accountability.

Assigning accountability to both a process owner and a process enactor breaks the RACI rule of single accountability and conflates the Accountable and Responsible roles.

The process architect is a design role and is not designated as the Accountable party in the ITIL process governance model; that role belongs to the process owner.