// description
A reasoning method that breaks a problem down to its most fundamental truths and builds up from there — rather than reasoning by analogy (doing things because others do them, or because "that's how it's done"). Strips away assumptions to reach bedrock facts.
// history
First principles reasoning dates to Aristotle, who described it as "the first basis from which a thing is known." In modern business discourse it became associated with Elon Musk, who described using it to challenge received wisdom in aerospace: instead of accepting that rockets cost a certain amount, he asked what rockets are actually made of and what those materials cost, then worked up from there. This led directly to SpaceX reducing launch costs by a factor of ten.
// example
Everyone assumes an online course needs video lessons, a learning management system, a Facebook group, and a launch sequence. First principles: what does a student actually need to learn a skill? Instruction, practice, feedback, accountability. You could deliver all of that via a PDF guide, email check-ins, and a Notion workspace — for a fraction of the cost and development time.
// katharyne's take
First principles thinking is how I built my Values Matrix framework — I stripped back every piece of received wisdom about "what a framework should be" and asked: what does someone actually need to get from confused to clear? Most of the time, the answer is much simpler than the standard model. Don't mimic what successful people do without asking why they do it. Start from the outcome you want and reason backwards.
// creative uses
- Before building your next KDP product, apply first principles: what does a buyer actually need from this book type? Strip away convention (standard interior templates, typical page counts, industry-normal covers) and design from the reader's actual use case up.
- Apply it to your Midjourney workflow: instead of copying other creators' prompts wholesale, ask what visual outcome you actually need and build the prompt from descriptive fundamentals — subject, lighting, composition, style — rather than recycling formulas.
- Use it to rethink your digital product pricing: instead of benchmarking against competitors, calculate the real value your product delivers (time saved, income generated, skill acquired) and price from that number down to what feels fair, not up from what everyone else charges.
// quick actions
- Pick one process in your business you've never questioned — your email welcome sequence structure, your product launch format, your content posting schedule — and ask: if I were starting from scratch today, would I do it this way? Write down the actual reason it exists.
- List every tool you pay for monthly. For each one, write one sentence describing what fundamental job it does. Then check: is there a simpler, cheaper, or free way to do that same job? Cancel anything that doesn't survive the test.
- Write a first-principles brief for your next course or product before opening Canva, Notion, or any template. One paragraph: what does the buyer actually need, what's the minimum viable delivery of that, what would genuinely be unnecessary?
// prompt ideas
Apply first principles thinking to how I currently [run my KDP publishing process / price my digital products / structure my online course]. Challenge every assumption I'm making by asking: is this actually necessary, or is it just how everyone else does it? Help me strip the process back to what a buyer fundamentally needs and rebuild from there.
I want to build [new product / new income stream] but I keep defaulting to the standard model I've seen others use. Use first principles to help me question every conventional element: what is the buyer actually trying to achieve, what's the minimum viable way to deliver that, and what "standard" parts of this format exist only by convention?
Here's a belief I hold about my [Etsy shop / course business / KDP strategy] that I've never questioned: [state the assumption]. Break it down with first principles — what evidence actually supports this? What would I do differently if I started from bedrock facts and ignored how everyone else operates in my niche?