Using PDSA Cycle to enhance 90-Second Rule

What each one is actually for

PDSA Cycle

PDSA is a loop for testing a change before you commit to it. Plan means writing down a specific, small change and a specific prediction of what will happen if you make it. Do means actually running it, briefly and on a small scale, one week, one team, one version of the form. Study means comparing what actually happened against the prediction you wrote down before you had a reason to be attached to being right. Act means deciding, based on that comparison, whether to adopt the change, adjust it, or drop it, rather than deciding based on how the change felt while you were running it.

90-Second Rule

The ninety-second rule works on a felt sensation, not a belief. When something happens that triggers a strong emotional reaction, anger, panic, humiliation, the initial chemical surge in the body has a limited physical duration, commonly cited as around ninety seconds, before it starts to fade on its own if nothing renews it. The practice is to notice the sensation as a physical event, where it sits in the body, how it moves, and deliberately not add the story that usually keeps it going, they always do this, this proves I am right to be furious, and instead just track the sensation until the intensity visibly drops.

What you get out of pairing them

The ninety-second rule promises something specific and checkable: that a feeling you do not feed will pass. Most people never actually find out if that is true for them, because they either feed the story immediately or distract away from the sensation entirely, so the claim stays a rumor about other people's stress research rather than a tested fact about their own body. PDSA gives you the discipline to actually find out, write the prediction before you sit with the feeling, then check the real result against it. What PDSA gets in return is a live, high-stakes place to practice its own core move, checking a prediction against reality, on something that happens several times a day instead of once a quarter in a work process.

What PDSA Cycle rests on

• Feedback against prediction corrects belief plausible mechanism
  Comparing the actual result of a change against the predicted result before adopting it corrects mistaken beliefs faster than adopting or rejecting changes based on intuition alone.
• Small scale testing precedes scaling observational studies
  Running a change through a small planned test cycle before wider adoption reveals real-world effects while limiting the risk of being wrong.

What 90-Second Rule rests on

• Interoceptive attention randomised trials
  Directing sustained attention to internal bodily sensations increases awareness of the body's state and changes how that state is experienced.
• Acceptance reduces struggle randomised trials
  Allowing an internal experience to be present without resisting or acting on it reduces the psychological struggle that resistance would otherwise intensify.
• Physiological arousal self resolves if unfed plausible mechanism
  An emotional chemical surge has a limited biological duration and will subside on its own if not renewed by continued thought.

Where they actually meet

PDSA's study phase and the ninety-second rule's noticing phase are doing the same job on different objects. Study means looking directly at what the data actually showed, not what you hoped the change would do, and accepting that result even when it disproves your plan. Noticing a sensation without feeding its story means looking directly at what the body is actually doing, not what the triggering story says it means, and letting that observation stand even when the story wants to keep running. Both require the same small, specific discipline: attend to what is actually there before you let a preferred narrative take over.

The principle underneath both

Widen interoceptive attention, paying deliberate attention to internal bodily signals, past the body alone and it describes something both practices do: sustained, disciplined attention to what is actually happening, rather than to what you assumed, predicted, or feared would happen. The ninety-second rule applies that discipline to sensation in the body. PDSA applies a structurally identical discipline to a work process, attend to the actual measured result, not the story you told yourself about how the change would obviously work. Both also require accepting that result once you have it, even a result that contradicts the plan, rather than resisting or explaining it away, which is the same move acceptance-based practices apply to an unwanted feeling, applied here to unwanted data.

What that makes the real goal

If the value in both comes from attending honestly to what is actually occurring, in a body or in a process, then the target both are aimed at is an accurate read of reality obtained before you decide what to do, rather than a decision made on the story you would prefer to be true. That target is reachable whether the thing you are reading is a spreadsheet of results or a sensation in your chest.

Other practices that serve the same goal

Cognitive defusion, a core technique from Acceptance and Commitment Therapy, ACT, for treating a thought as an event passing through the mind rather than a fact about the world, has randomized trial support and reaches a similar target from the thought side rather than the sensation or process side. Broader mindfulness-based stress reduction programs, with a large randomized-trial evidence base, train the same sustained, non-reactive attention across both bodily sensation and thought. In a completely different domain, the A/B test, running two versions of something and measuring which actually performs better rather than guessing, is PDSA's close cousin in digital product work, aimed at the identical target of checking assumption against outcome.

A tradition that already does this

The noting practice used in Vipassana meditation already runs a version of this loop on felt experience, long before either modern name existed: sit with a sensation, label it plainly, rising, or burning, or tight, watch what it actually does rather than what you expect it to do, and let your understanding of your own reactivity update based on that observation instead of your prior story about it. That is a plan-do-study-act cycle turned entirely inward, run on breath and sensation instead of a work process, and it is very likely one of the traditions the ninety-second rule itself is quietly descended from.

Using PDSA to Enhance the 90-Second Rule

Most people who try the ninety-second rule once, notice it did or did not work, and never actually build a reliable read on their own pattern. Run it as an actual PDSA cycle instead. Plan: before the next time you expect a spike, write down a specific prediction, this will peak and visibly ease within about ninety seconds if I only track the sensation. Do: when it happens, track the sensation, where it sits, whether it is expanding or shrinking, without narrating the trigger. Study: afterward, actually check, did the intensity noticeably drop by roughly then, or did it hold much longer, and if so what were you actually doing during that time. Act: adjust your working theory of your own body based on that specific data instead of the generic claim, some people's spikes run longer under certain triggers, and now you know your own number.

Using the 90-Second Rule to Enhance PDSA

PDSA's study phase asks you to look honestly at a result that might disprove your plan, and that honesty is harder than it sounds when the result stings, a change you championed did not work, a number came back worse than you predicted. That sting is a real physiological spike, not just an intellectual disappointment, and it is exactly the kind of spike the ninety-second rule is built for. Before you write the study-phase conclusions, or worse, before you defend the plan in a meeting while the spike is still live, notice the sensation, let the initial defensive charge pass without narrating it into a justification, and only then look at the actual data. A study phase run from inside an unprocessed spike tends to quietly rewrite the numbers to protect the plan; one run ninety seconds later tends not to.

The retro meeting where your metric came back flat

You proposed the change, ran it for two weeks exactly as planned, and predicted in writing that response time would drop by half. It dropped by four percent. Reading the number on the shared screen, your face goes hot and the first sentence forming in your head is a defense, the sample size was too small, or, the team did not actually follow the process correctly. That is the surge, and it is close to identical to the one Jill Bolte Taylor described watching happen in her own body, chemical, physical, temporary. You say nothing for a moment, feel where it sits, a tightness across the chest, and let it sit there without adding a sentence to it. About a minute later, the urge to defend the plan has genuinely quieted, and you look at the number again with something closer to actual curiosity: four percent is not nothing, and it is nowhere near what you predicted, so what was wrong with the prediction, not the team. That question only shows up once the spike has had its ninety seconds.

When this is worth reaching for

Two separate gaps, one fix. Running PDSA cycles at work, in a team, in a process, you've noticed your own study phase quietly bends toward whatever result you were hoping for. Practicing the ninety-second rule, you've tried it once or twice and are still assuming the number you read somewhere describes your own body's timing, rather than having actually clocked it for yourself.

Where this does not apply

If the emotional reaction in question is not a short chemical spike but a sustained state, ongoing grief, clinical depression, chronic anxiety, the ninety-second framing does not apply and waiting it out is not the right move, that calls for a different kind of support entirely. And if the process you are trying to improve with PDSA has stakes too high or too slow for small-scale testing, a single irreversible decision, a change that takes a year to show any signal, the cycle's small-test structure does not fit the situation and forcing it on would produce false confidence from an underpowered trial of one.

What the evidence does and does not support

The two halves of this pair rest on different footing worth naming specifically. Sustained attention to bodily sensation and accepting an internal state without resisting it both have real randomized-trial support, mostly from mindfulness and acceptance-based therapy research, and are genuinely well established. The specific ninety-second figure is closer to a widely repeated estimate from one well-known personal account than a precisely measured constant, actual physiological recovery time from a stress spike varies by person and by trigger, so treat ninety seconds as a useful rough target to test against, not a number to take literally. PDSA's core logic, testing small before scaling and checking a real result against a stated prediction, is mechanistically sound and widely used in quality improvement, though PDSA as a formal method has less controlled-trial evidence behind it than you would expect given how common it is, most of its support is observational, drawn from organizations that used it and reported what happened.