Think of one change you've wanted for a long time. To delegate more. To speak up in meetings. To raise your prices. To finally finish the project. You know why it matters. You've made the plan, maybe more than once.

And yet, months later, you're doing the same thing.

Most of us explain this as a lack of discipline. Harvard researchers Robert Kegan and Lisa Laskow Lahey found something more interesting. In their book Immunity to Change, they show that when smart, motivated people don't change, it's rarely because they don't want to. It's because another part of them is working, just as hard, to keep things exactly as they are.

In this post I'll show you how that works, and what it looks like for each of the 12 archetypes. Your archetype can tell you a lot about which hidden commitment is holding you back. If you don't know your leading archetypes yet, take the free archetype test first.

Kegan and Lahey compare it to the body's immune system. Your immune system is brilliant: it protects you from danger. But sometimes it attacks something that would actually help you, like a transplanted organ. Our minds do the same with change. They reject it, not because it's bad, but because it threatens something we're quietly protecting.

They map this in four columns. It's the simplest way to see your own pattern:

1. My goal. The change I genuinely want. "I want to delegate more."
2. What I do instead. The behaviours that work against it, listed honestly, without judging them. "I redo my team's work. I say 'it's faster if I do it'."
3. My hidden commitment. What those behaviours are protecting. To find it, imagine doing the opposite and notice the worry that comes up. "I'm committed to never letting something go wrong on my watch."
4. My big assumption. The belief that makes that commitment feel necessary. We don't hold it; it holds us. "If something goes wrong, people will see I'm not good enough."

Read columns 1 and 3 together and you'll see the problem: one foot on the gas, one on the brake. You're not lazy. You're committed to two things at once, and the second one is stronger because it protects you from a fear.

That's also why advice like "just delegate" doesn't work. Kegan and Lahey call this an adaptive challenge, not a technical one. A technical problem needs new skills or information. An adaptive one needs a change in how you see yourself and the world, starting with the big assumption.

Here's what I see in my coaching work: the hidden commitment is rarely random. It usually grows out of your leading archetype. Each archetype's greatest gift has a fear behind it, and under pressure the gift turns into protection.

The Caregiver's gift is care. Its fear is being unneeded, so its hidden commitment is to stay indispensable. The Ruler's gift is order. Its fear is chaos, so it commits to control. The gift and the brake come from the same place.

The psychoanalyst and leadership professor Manfred Kets de Vries calls this our inner theatre: a stage where the people and roles of our early life keep playing their parts. The big assumption is often a line from that old script. "If I'm not useful, I'm not loved" may have been true for a child in a particular family. Today it quietly runs a leader's calendar.

That's why insight alone rarely changes much. You can understand your pattern perfectly and still repeat it, because the script was written long before you could question it.

These are the patterns I see most often for each archetype. Yours may be different: treat them as a starting point, not a diagnosis.

Take 15 minutes and a piece of paper. Answer these in order, as honestly as you can:

1. What's one change that really matters to you right now? Make it about you, not other people: "I want to delegate more", not "my team should be more independent".
2. What do you do, or not do, that works against it? List your behaviours and don't fix them yet.
3. Imagine doing the opposite of each behaviour. What's the most uncomfortable feeling that comes up? Stay with it until you find the worry underneath. That worry points straight to your hidden commitment.
4. Turn the worry into a commitment. If the worry is "they'll think I'm incompetent", the commitment is "I'm committed to never looking incompetent".
5. Ask: what would have to be true for that commitment to make sense? That's your big assumption, usually an "if… then…" sentence.

If your answers look a lot like your archetype's row in the table, you've found your pattern. If they surprise you, even better: look at your second and third archetypes, and at your lowest score. The hidden commitment often lives where we least expect it.

I'm making a free printable worksheet for this exercise. It'll be in my next post.

You don't overcome immunity to change by fighting your hidden commitment. It's protecting you, and it will win. You loosen it by testing the big assumption, gently, until your mind has new evidence.

• Watch first. For one or two weeks, just notice when the assumption shows up. What triggers it? What happens in your body? Don't change anything yet.
• Run a small, safe test. Choose one action that goes against the assumption, where the cost of being wrong is low. The Ruler delegates one small task and doesn't check it. The Sage decides one thing with 70% of the information. The Lover gives one honest piece of feedback.
• Look at what really happened. Not what you feared, but what actually happened. Did it fall apart? Did they leave? Usually the answer is more complicated, and much kinder, than the assumption.
• Update the assumption. Not "it's never true", but "it's true sometimes, in these conditions". That's when the brake starts to release.

Kegan and Lahey call the result a bigger mind: you can still use your archetype's gift, but now you choose when, instead of the old script choosing for you.

1. Find your archetypes: take the free archetype test. Your results include your leading archetype's trap and your lowest score.
2. Go deeper: my guide Your Archetype has a chapter on each archetype, with the psychology behind it, the leadership style, money patterns and a growth plan.
3. Work on it with me: when a pattern keeps repeating, however well you understand it, that's a sign it has deeper roots. That's what I work on with leaders, founders and business owners. Book a session.

Based on the work of Robert Kegan and Lisa Laskow Lahey (Immunity to Change, Harvard Business Press, 2009) and Manfred Kets de Vries on the inner theatre of leaders.

One question to sit with this week: what am I protecting myself from by not changing?