Reasoning from First Principles: How to Master Solving Hard Problems

Why You Should Reason from First Principles

Solving hard problems means thinking differently.

By nature of the role, not everything will work as it should.

Complexity creates problems .

And it is here that you either win or lose opportunities .

Customers aren't impressed with temporary solutions.

Yes, in the short term, it removes the pain, but it doesn't stop the problem from occurring again.

And the bigger the customer, the more adverse they are to risk.

They know that an explanation that contains the root cause demonstrates understanding.

These are the foundations of a proper solution.

Let's forget temporary fixes and instead use a framework for finding the true problem.

What is Reasoning from First Principles?

Reasoning from first principles means cutting through assumptions and traditions, boiling a problem down to the core facts you know for certain.

By working from these basic truths, you build solutions that tackle the true cause—not just the symptoms—so you solve problems at their root.

This framework encourages deep questioning and critical thinking.

It takes you away from assumptive thinking — and closer to the structured decisions that leaders rely on.

How to Reason from First Principles

Reasoning from first principles is like going down a rabbit hole to the earth's core. When you return through the warren it's from a different — quicker — way to the one you descended.

That journey is worth it.

Because what you discover at the core is a foundation from which your solution can be built.

Here's the steps:

1. Define the problem
2. Break it down
3. Challenge your assumptions
4. Rebuild your solution

Step 1: Define the Problem

Start by naming the problem clearly.

This is not always easy because problems can be masked by symptoms.

However, clarity starts by defining the problem and separating it from its symptoms.

To define the problem, use these two questions:

• Is this a problem or a symptom?
• What is the simplest, most accurate statement of this problem?

Step 2: Break It Down

Decompose the problem into its smallest components to see the whole picture.

Break the problem down using these two questions:

• What are the parts of this problem?
• What inputs, actions, and constraints are involved?

Step 3: Challenge Your Assumptions

Question every assumption — even the ones that feel solid.

You will see that some of your assumptions are just not true.

Challenge your assumptions using these two questions:

• What am I treating as fixed that could actually change?
• Which beliefs come from habit rather than evidence?

Step 4: Rebuild your Solution

Rebuild your solution from the ground up using only the facts and principles you've uncovered.

Rebuild your solution using these two questions:

• What would we do if we had no prior assumptions?
• What does this approach reveal that our old model missed?

First Principles Thinking: The Nick Kokonas Story

Nick Kokonas, the co-owner of some of Chicago's most acclaimed restaurants, asked a simple question:

Why do restaurants give away their most valuable asset — guaranteed revenue — to no-shows?

The industry accepted no-shows as an unavoidable loss.

Nick didn't.

He stripped the problem back to basics: a meal reservation is a commitment, so why isn't it treated like one?

From that starting point, he built a ticketing system — Tock — that charges customers upfront, just like a concert or a flight.

No-shows dropped. Revenue became predictable.

The solution wasn't complex — it just required refusing to accept the old assumption.

That's reasoning from first principles.

You don't just solve the problem differently — you reframe it entirely.

First Principles and Your Decisions

Effective decision-making at its most fundamental requires clarity about the facts — not comfortable approximations of them.

When you reason from first principles, you strip away the assumptions that make your decisions feel safe but keep them stuck.

The result isn't just a better solution to the problem in front of you.

It's a sharper, more honest way of leading — one decision at a time.