Immunity to Change Kegan Lahey
One book, placed in its field — what this book gets right, where it goes further than the rest, and what the rest of the field adds.
Mike West, Editor · HR Leader Guide · bicycle.guide/guides/profile-immunity_to_change_kegan_lahey
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Immunity to Change Kegan Lahey
One book, placed in its field — what this book gets right, where it goes further than the rest, and what the rest of the field adds.
Mike West, Editor · HR Leader Guide · bicycle.guide/guides/profile-immunity_to_change_kegan_lahey
The problem
Achievement of Improvement Goal erodes when it is left to instinct instead of method.
You were taught the moves piecemeal, never the whole model.
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
The model
- 01Immunity Overcoming Process
- 02Perceived Validity of Big Assumptions
- 03Strength of Competing Commitments
- 04Adaptive Behavioral Repertoire
- 05Achievement of Improvement Goal
- 06Mental Complexity Advancement
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
Step 1 of 5 · Immunity Overcoming Process
The process has two irreducible halves: a diagnostic map and a run of assumption tests — doing only the first is the most common failure.
Misconception
Practitioners treat the four-column map as the deliverable — as if naming your hidden commitments is itself the transformation.
Reality
The map is only diagnosis; change happens when you design safe, observable tests that generate disconfirming data your nervous system cannot dismiss. Reflection alone leaves the immune system fully intact.
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
Step 2 of 5 · Perceived Validity of Big Assumptions
A Big Assumption's validity is measured by how automatically it dictates your response, not by whether you consciously endorse it.
Misconception
People think identifying a Big Assumption reduces its power — that once you've named it, you've neutralized it.
Reality
Naming an assumption often leaves it fully operative; its validity drops only when lived experience contradicts it under conditions you designed to notice. Awareness and belief are separate systems.
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
Step 3 of 5 · Strength of Competing Commitments
Your self-sabotaging behavior is a competing commitment doing its job, not a character flaw.
Misconception
Practitioners believe the obstructive behaviors are failures of discipline that more effort or accountability will fix.
Reality
The obstructive behaviors are brilliantly effective — they perfectly protect a commitment you hold, such as staying safe from exposure or conflict. The system isn't broken; it's working exactly as designed against you.
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
Step 4 of 5 · Adaptive Behavioral Repertoire
Adaptive capacity shows up as range — the same new behavior working across varied, harder situations.
Misconception
People assume that one successful new behavior means the change has taken hold.
Reality
A single act against an old pattern is fragile; an adaptive repertoire is a stable, flexible set of responses you can deploy across contexts because the fear no longer governs them. Range and repeatability are the markers, not one brave moment.
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
Step 5 of 5 · Achievement of Improvement Goal
True achievement is durable and low-effort — you no longer fight yourself to maintain it.
Misconception
Practitioners judge success by whether the goal was reached at all, treating any improvement as completion.
Reality
Achievement here means the improvement is sustained without ongoing effortful suppression of the old system — a change you no longer have to white-knuckle. Temporary attainment under strain is not achievement; it's the immunity waiting.
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
A framework to use
The Immunity to Change Framework
This framework is part of the full guide. See the guide →
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
The cheat sheet
- Immunity Overcoming ProcessThe process has two irreducible halves: a diagnostic map and a run of assumption tests — doing only the first is the most common failure.
- Perceived Validity of Big AssumptionsA Big Assumption's validity is measured by how automatically it dictates your response, not by whether you consciously endorse it.
- Strength of Competing CommitmentsYour self-sabotaging behavior is a competing commitment doing its job, not a character flaw.
- Adaptive Behavioral RepertoireAdaptive capacity shows up as range — the same new behavior working across varied, harder situations.
- Achievement of Improvement GoalTrue achievement is durable and low-effort — you no longer fight yourself to maintain it.
- Mental Complexity AdvancementDevelopmental advancement means turning what runs you into something you can observe and choose about — subject becomes object.
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide
Sources
- Immunity to Change Kegan Lahey
Immunity to Change Kegan Lahey · Mike West, Editor · HR Leader Guide