Po: Provocation and Zero-Hold
Use a single signal word to introduce productive provocations and suspend premature pattern entry
'Po' is a word invented by de Bono to serve two related functions. First, it signals a provocation: a deliberate stepping-stone statement that lies outside normal experience patterns and is intended to force the mind off its established track. Second, it serves as a 'zero-hold': a mathematical analogue of zero in arithmetic, acknowledging unconceived alternatives that currently have no form but do exist as a space. Just as zero is a position without a value that made arithmetic tractable, 'po' is a placeholder for patterns not yet formed. Both uses address the problem that the brain cannot tolerate suspension of pattern activation—po provides a socially and intellectually legitimate way to pause.
- There may be no reason to say something until after it has been said—provocation has its justification after the fact
- Provocation is a mathematical necessity in self-organizing systems: IBM researchers confirmed this for Boltzmann equations in 1982
- Zero-hold acknowledges the existence of unconceived alternatives without forcing them into known patterns
- Po is stronger than 'maybe' or the Japanese 'mu'—it is not 'don't know' but 'don't yet want to know'
- The po signal prevents premature dismissal of an idea by flagging it as a stepping stone, not a proposal
- Movement (not judgement) is the correct response to a provocation
- Use Po as a provocation signalPrefix a deliberately contrary, absurd, or impossible statement with 'po' to signal it is a stepping stone: 'po cars have square wheels', 'po the factory is downstream of itself'. The signal prevents dismissal and licenses forward movement.Pro tipThe provocation should be specific enough to activate concrete patterns but contrary enough to escape the main track.WarningWithout the po signal, the provocation will be dismissed as nonsense before any movement can occur.
- Apply movement from the provocationAsk: what principle does this reveal? What would have to change for this to work? What useful idea lies in the direction this points? Move forward; do not evaluate the provocation.Pro tipIt helps to ask 'what are the benefits of this, if any?' rather than 'is this realistic?'
- Use Po as a zero-holdWhen someone presents only two alternatives, respond: 'there are these two, and po'—acknowledging that unconceived alternatives exist as a space. Use po to introduce a deliberate pause before snapping into the most obvious response pattern.Pro tipIn negotiation or conflict situations, saying 'po' internally (as a trained pause) before responding reduces reactive escalation.
- Practice Zero-Hold in high-stakes responsesWhen told something alarming or provocative, instead of immediately entering a reaction pattern, say 'po'—meaning: I have received this information and am deliberately not rushing into judgment. This is similar to counting to ten, but grounded in system logic.Pro tipDe Bono cites a case where teaching CoRT thinking (which introduces structured pauses) to violent adolescents dramatically reduced violence by creating a gap between trigger and reaction.WarningZero-hold is not indifference or denial—it is active suspension of premature pattern commitment.
Provocation: 'po cars have square wheels.' Movement from this: what if the suspension adjusted dynamically so the car body floated smoothly regardless of wheel motion? The idea led to the concept of active suspension.
David Lane at the Hungerford Guidance Centre taught CoRT thinking lessons to youths too violent for ordinary schools. The thinking structures introduced a pause element between trigger and action.
De Bono coined 'po' from words like hypothesis, suppose, possible, and poetry—all cases where a statement is used to move forward rather than to assert truth. The word also stands for 'provocative operation'. The zero-hold function came from de Bono's observation that mathematics had a zero (a position without value) but human thinking had no equivalent, leaving us unable to acknowledge what we could not yet conceive. Both uses are described in detail in this book.