Assign exactly one Accountable per decision

Every decision or deliverable must have exactly one A — not zero, not two.

Why it works

When two people share accountability, neither feels fully responsible — diffusion of responsibility means each assumes the other will catch problems. When no one is accountable, the decision drifts. Assigning a single A creates a clear escalation path and a single person whose job it is to make sure the decision gets made and the output gets delivered.

How to do it

1. List every major decision, deliverable, and task in the project.
2. For each one, name one person — by role, not just by name — who is Accountable. Challenge any row with two A’s until one becomes Responsible.
3. The Accountable person need not do the work; they must ensure it gets done and have authority to approve the result.

Evidence

Diffusion of responsibility is a well-documented social psychology phenomenon: as the number of people who share ownership increases, each individual’s sense of personal responsibility decreases. Single-owner accountability design directly counters this. The social loafing and Ringelmann-effect studies extend this further, measuring that individual effort itself falls as group size grows — so shared ownership dilutes not just felt responsibility but actual contribution. (observational)

The bystander research is about emergency response; its application to organizational accountability is an analogy that is widely accepted in management practice but has not been tested with the same experimental rigor.

Sources

• Darley, J. M. & Latané, B. (1968). Bystander intervention in emergencies: Diffusion of responsibility. Journal of Personality and Social Psychology, 8(4), 377–383.
• Darley, J. M., & Latané, B. (1968). Bystander intervention in emergencies: Diffusion of responsibility. Journal of Personality and Social Psychology, 8(4, Pt.1), 377–383.
• Latané, B., Williams, K., & Harkins, S. (1979). Many hands make light the work: The causes and consequences of social loafing. Journal of Personality and Social Psychology, 37(6), 822–832.
• Ingham, A. G., Levinger, G., Graves, J., & Peckham, V. (1974). The Ringelmann effect: Studies of group size and group performance. Journal of Experimental Social Psychology, 10(4), 371–384.

Common mistake

Listing two A’s in a row to "share the load" — which creates ambiguity about who makes the final call and reliably leads to missed deadlines or conflicting decisions.