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A business plan used to be the starting point for any new product or venture. Fifty pages, six months of work, detailed financial projections for years that hadn’t happened yet. By the time it was done, half the assumptions were already wrong. The startup canvas - specifically the Lean Canvas, created by Ash Maurya as a startup-friendly adaptation of Osterwalder’s Business Model Canvas - replaced all of that with a single page. Rough, fast, and designed to be thrown away and rewritten as you learn 🙌

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The nine boxes

The Lean Canvas captures your business model across nine interconnected blocks: Problem - The top three problems your target customers face. If you can’t name them specifically, you’re not ready to build anything yet. Customer segments - Who has these problems? Include your early adopters separately - they’re the ones you’ll learn from first, and they’re usually a subset of your broader target. Unique value proposition - One clear sentence that explains what you do, for whom, and why it’s different. Harder to write than it sounds. Solution - Your proposed solution to the top problems. Keep it high-level at this stage - you haven’t validated it yet. Channels - How do you reach your customers? How do they find you? Revenue streams - How does the business make money? What’s the pricing model? Cost structure - What does it cost to build and run this? Key metrics - The one or two numbers that tell you whether the business is working. Forces you to define success before you start (see Opportunity Assessment). Unfair advantage - What do you have that can’t easily be copied? This is the hardest box to fill honestly, and most early-stage canvases leave it blank - which is itself useful information.

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How to use it

Fill it in fast - 20 minutes maximum. The goal is to make your current assumptions visible, not to get them right. Every box is a hypothesis, not a fact. Then take it apart. Which assumptions are most critical? Which are least tested? Prioritise the riskiest ones and go find out if they’re true. The canvas is a living document - update it as you learn. Eric Ries makes this case throughout The Lean Startup: build, measure, learn, repeat. The canvas is where you capture what you currently believe before you go test it.

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Canvas vs. PRD

The startup canvas and the PRD serve different purposes at different stages. The canvas is for the earliest phase - when you’re still questioning whether the business model makes sense at all. The PRD comes later, once you’ve validated enough to start defining what to build. If you’re working on a new product inside an existing company, the canvas is still useful - it forces the same questions about problem, customer, and value proposition that often get skipped when there’s already a budget and a roadmap in place 😅 Lesson learned: the box that exposes the most gaps is always the unfair advantage. If you can’t articulate what makes you uniquely positioned to solve this problem, that’s worth sitting with before you write a line of code 👊