The Collison Decision Matrix 

A Simple Framework for Better Choices

The Collison Decision Matrix: A Practical Everyday Thinking Tool

Most of us spend a surprising amount of time worrying about decisions. From small ones such as what to wear, what to eat, what to text someone to much bigger one like changing jobs, ending relationships, moving house, choosing a path in life.

Some of us overthink; others rush in and regret it later.

What if there was a way to tell, before you decide, whether you should slow down or just go ahead?

Patrick Collison, co-founder of Stripe, a global financial technology company, offered one of the simplest and most useful tools for this.

It’s become know as The Collison Decision Matrix, and it’s built around just two questions:

1. How big is this decision?
2. Can I change it later?

Collison originally developed this idea inside Stripe as a way to help his teams make better decisions at speed.

Stripe was growing quickly, and Collison saw that what slowed progress wasn’t always poor judgment, but poor decision process.

He began categorising choices by their magnitude [how much they matter] and reversibility [how easy they are to change].

Thinking About Thinking

But what makes the Collison Decision Matrix so powerful is that it doesn’t just apply to companies—it applies to life.

Once you start using it, you begin to see that the way you decide often matters more than the decision itself.

Some choices deserve deep reflection. Others don’t. Knowing the difference saves you enormous mental energy.

At its heart, this is a practical thinking skill—a way to think about thinking before you act.

Let’s break it down in simple terms.

There are four basic types of decisions:

[1] Small And Reversible

These are the easiest kind.

Things like trying a new hairstyle, testing a new app, or deciding what to cook for dinner. These are low-cost experiments.

The rule here is simple - decide fast and move on. Overthinking small, flexible choices wastes energy you could use elsewhere.

[2] Small But Hard To Reverse

Maybe you’re choosing a new wallpaper, getting a tattoo, or signing up for a year-long gym contract. These decisions don’t matter hugely in the grand scheme of life, but they’re sticky once made.

The smart move here is to set some simple personal rules or “default settings” so you know in advance how you will apporach these types of decisions.

For example: “Never sign long contracts without a one-month trial.”

These kinds of policies save you from repeating the same minor mistakes.

[3] Big And Hard To Reverse

These are the ones that shape your life.

• Moving in with someone.
• Having a child.
• Buying a home.
• Starting or ending a marriage.
• Changing careers after years of investment.

These are “one-way doors.” You can’t just step back through if you change your mind.

They deserve slow, careful, thoughtful attention. Ask questions, gather facts, test assumptions.

Take time, but not forever—because hesitation can also cost you. Just give big, irreversible choices the depth they deserve.

[4] Big But Reversible

These are interesting because they feel scary, but they’re often not final.

Quitting a job might feel permanent, but you can usually find another. Trying a new kind of work, starting a side project, taking a course, moving cities for a few months—all these are big but adjustable.

Collison suggests that once you’re about 70% confident, you should go ahead -  you learn more by acting than by waiting.

The beauty of reversible big decisions is that they teach you fast. You can pivot. You can recover.

When you start to view decisions through the lens of the Collison Decision Matrix, something changes inside you.

You realise that most of the stress around decisions doesn’t come from the decisions themselves, but from not knowing how seriously to take them.

The Collison Matrix gives you permission to move quickly where it’s safe, and carefully where it’s not.

Proportionality

The Collison Matrix naturally pushes you to design small, safe experiments instead of all-or-nothing leaps.

You can also apply this to money decisions. Buying an expensive item that can be returned - reversible. Buying one that can’t - irreversible.

Knowing that difference lets you spend confidently without post-purchase regret. Or to health: trying a new form of exercise is reversible; undergoing elective surgery is not. Match your level of care to the reversibility.

What makes this tool so powerful is how it brings calm clarity. Most overthinking happens because we treat all decisions as equally serious.

Most regret happens because we treat irreversible choices too casually.

The Collison Decision Matrix slices through both errors. It teaches proportion.

A Mindful Approach To Decision Making

This mindset aligns beautifully with the Zen Tools approach to thought-awareness. When you pause before deciding and ask, “What kind of decision is this?”, you’re stepping out of your thought stream and observing it.

You’re not just reacting - you’re seeing the thought and deciding consciously how much energy it deserves. That’s metacognition in action.

In time, this habit becomes a kind of mental muscle memory. Before you start overthinking, you notice: “Ah, this is small and reversible- I can move on.”

Before you rush something serious, you sense the need to slow down. You begin to spend your mental energy more wisely.

If you practice this for a week, you’ll start to notice patterns. You might find that 80% of your daily decisions are small and reversible. Yet those are the ones that consume most of your mental bandwidth.

You’ll also notice that you sometimes avoid the big, irreversible decision - the ones that would actually move your life forward - because they feel heavy.

The matrix helps correct both tendencies. It teaches proportionate thinking: light touch for light things, full attention for heavy ones.

In Zen terms, this is the practice of mental clarity: responding to what’s real instead of what’s imagined.

Points For Reflection

• When did I last overthink something small that didn’t really matter?
• Which decision in my life feels big and irreversible right now—what would deeper reflection look like there?
• Which big decisions might actually be more reversible than I assume?
• Where could I act faster without fear?
• How might I reduce regret by matching my attention to the true size and reversibility of each choice?

Points For Action

• For the next week, before every decision, ask: “How big is this? Can I change it later?”
• Write down one decision a day and identify which type it was.
• Notice how your mind feels when you stop overthinking small things.
• Notice where slowing down prevents mistakes.

By the end of the week, you’ll feel lighter - not because life got easier, but because your thinking got clearer.

That’s the quiet power of the Collison Decision Matrix: proportionate awareness.

It’s a map for calm, intelligent action - one that helps you move through daily life with less noise and more clarity.

Recommended Further Reading

The Eisenhower Box - What Is Important Is Seldom Urgent And Vice Versa

Return from: The Collison Decision Matrix "  to: Inner Mastery For Outer Impact or Mental Models

Next Article: Why You Need To Be Intimate With Your Own Thinking

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