thinking-ooda

OODA Loop

Overview

The OODA Loop (Observe, Orient, Decide, Act) is a framework for acting in fast-moving, uncertain situations. The core decision rule: don't wait for certainty—act on the best current understanding, then immediately observe the result and loop again. Speed through the loop beats a perfect plan that arrives too late.

Core Principle: Act on ~70% confidence for reversible moves, then re-observe. Cycle faster than the situation changes.

When to Use

• Incident response and outages
• Debugging a moving target (intermittent failure, ongoing degradation)
• Any time-sensitive decision where the situation is still changing

Situation changing rapidly AND need to act before certainty? → yes → APPLY OODA
                                                              → no  → use deliberate analysis / a hypothesis differential

When NOT to Use

• The situation is static and you have time → deliberate analysis beats fast looping.
• The action is irreversible/high-blast-radius → gather more information before acting; 70% confidence isn't enough.
• You can cheaply and directly localize the cause (read the diff/log) → use thinking-scientific-method (hypothesis differential) instead of looping in the dark.

Trigger Card

When under time pressure (incident, outage, debugging a moving target) and you must act before certainty:

1. Observe — what is happening right now? Gather the cheapest, highest-signal data available.
2. Orient — what does it mean given your mental model? Update the model if the data contradicts it.
3. Decide — pick an action on ~70% confidence. Don't wait for 100%.
4. Act — execute, then immediately re-observe. The loop is the point; speed beats precision.

If the action is irreversible or high-blast-radius, gather more information before acting. If you can cheaply localize the cause (read the diff/log), use thinking-scientific-method instead.

The Four Phases

1. OBSERVE — gather current state fast

• Current metrics, logs, alerts, error rates
• What changed recently (deploys, config, traffic)
• Feedback from your last action
• Cast wide, then narrow as a pattern emerges. Time-box it—don't observe forever.

Incident: error rate 10x normal; affects API gateway + user service;
started 5 min ago; a deploy went out 15 min ago; users report login failures.

2. ORIENT — make sense of it (the critical phase)

Match the observations to a pattern and form a hypothesis. This is where most loops go wrong: don't lock onto the first framing. Hold ≥2 candidate explanations and let new evidence shift you.

Pattern resembles last month's connection-pool exhaustion, BUT no DB anomaly this time.
The deploy touched auth rate-limiting.
Hypothesis: rate-limit config is too aggressive.

3. DECIDE — pick an action under uncertainty

• State the action and the hypothesis it tests.
• 70% confidence now beats 90% too late, for a reversible action.
• Decide what you'll observe next to confirm or refute.

Decision: roll back the auth deploy.
Hypothesis: this restores normal error rates.
Will watch: error rate for 2 minutes; fallback = investigate DB connections.

4. ACT — execute, then immediately re-observe

Execute decisively and go straight back to OBSERVE. The action creates new information; don't wait blindly for it to "settle."

Action: roll back deployment/auth-service.
Immediate observe: error rate, response times, 2-minute window.

The loop restarts until the system is stable.

What Speeds the Loop

Speeds it up	Stalls it
Pre-planned responses for known scenarios	Waiting for certainty (stuck at Observe/Decide)
Good observability (fast, trustworthy signals)	Information overload (Observe never ends)
Clear hypotheses (fast Orient)	Locking onto one hypothesis (Orient lock)
Reversible actions you can undo	Seeking the perfect fix (Decide never ends)

Application Patterns

Incident Response

OBSERVE: metrics, logs, alerts, recent changes
ORIENT:  match pattern, form ≥2 hypotheses, assess blast radius
DECIDE:  mitigation (rollback, scale, disable feature)
ACT:     execute, immediately observe results
LOOP:    continue until stable

Debugging Under Pressure

OBSERVE: errors, stack traces, recent changes
ORIENT:  form a hypothesis about the cause
DECIDE:  test the most likely hypothesis first
ACT:     add logging / try the fix / eliminate the possibility
LOOP:    update the hypothesis from the result

Common Failure Modes

Failure	Symptom	Fix
Observation overload	Can't process all data	Filter to key indicators
Orientation lock	Stuck on one hypothesis	Force a second framing
Decision paralysis	Waiting for certainty	Set a decision deadline; act on 70%
Action without observation	Blind execution	Mandate observe-after-act
Not actually looping	Stuck in one phase	Time-box each phase

Key Questions

• "What do I observe RIGHT NOW?" (not 5 minutes ago)
• "What pattern does this match—and what's my second hypothesis?"
• "What's my best reversible action given current understanding?"
• "How will I know in the next 2 minutes whether it worked?"
• "Am I cycling, or stuck in one phase?"

Boyd's Insight

"He who can handle the quickest rate of change survives." The goal isn't just making decisions—it's making and revising them faster than the situation compounds. Speed creates options; delay eliminates them.