The thing about value leaks I've sat with dozens of people running their own thing, and they all tell me the same story at some point: "We're profitable, but not as profitable as we should be." They know something's wrong. They can feel it. But they can't see it. The Business Model Canvas is meant to be a strategic tool. Most people use it to plan. I use it to diagnose. There's a difference. A leak in your business model isn't always obvious. It's not the big dramatic crack that floods everything. It's the slow seep that costs you 8% of your margin without you noticing it until you look at last year's numbers and think, "Where did that go?" The nine boxes that tell you everything The Business Model Canvas has nine sections. Key Partners, Key Activities, Value Proposition, Customer Relationships, Customer Segments, Key Resources, Channels, Cost Structure, Revenue Streams. Most people fill it in once and forget about it. I think about it differently. Each box is a potential leak point. And the real damage happens in the spaces between them. Let me be specific. Take Customer Segments and Channels. I worked with a service business last year doing well enough, but they were spending money on three different customer acquisition channels. When we mapped it properly, we saw they were acquiring the same type of customer through all three paths. They were paying three times to reach one audience. That was costing them roughly 32% of their marketing budget for zero additional customers. They didn't realise because they'd built each channel separately, at different times, without looking at the whole picture. That's a leak. Not a disaster. Just invisible waste. Where the real damage happens The biggest leaks I see cluster around three areas. First: misalignment between your Value Proposition and your Key Activities. You're saying you deliver X, but you're actually built to deliver Y. So you're either doing extra work to make X happen (cost leak) or you're selling something you're not actually good at (revenue leak). I see this constantly with people who've pivoted their business but haven't fully reworked their operations. They say they do custom work. They're organised for volume. They say they're premium. They're priced like commodity. The mismatch burns cash. Second: Customer Relationships that don't match your Revenue Model. If you're selling a one-off product but you're organised to maintain ongoing relationships, you're spending money on retention that doesn't exist. Conversely, if you're selling subscriptions but you're treating every customer like a one-time transaction, you're losing repeat revenue. I've seen subscription businesses lose 40% of potential lifetime value because they didn't build relationship infrastructure. Third: Key Resources that don't align with Key Activities. You've hired for what you used to do, not what you're doing now. You're paying for capacity you don't use. You're renting space for a team that's half remote. These aren't massive individual leaks, but they stack. I've watched small teams waste 15-20% of their overhead on misaligned resources. The current environment makes this worse. Minimum wage just rose to £12.71 an hour. Energy costs are up. Mortgage rates are climbing. If you've got a leak in your business model, you can't just absorb it with margin anymore. The Bank of England is warning about supply shocks. Rightmove's getting sued for excessive fees. Every business is being squeezed. The ones that survive are the ones running tight. How to actually spot it Don't just fill in the Canvas and move on. Map it. Actually draw lines between the boxes showing how they connect. Where does value flow from Key Resources to Key Activities? Where does it flow from Key Activities to Value Proposition? Where does it flow from Value Proposition to Revenue Streams? Then ask: is anything getting lost along the way? Example. You have Key Resources: your team and your software. Key Activities: client delivery and reporting. Value Proposition: fast, accurate results. Customer Segments: mid-market agencies. Revenue Streams: monthly retainers. Now trace it. Your team does the work. Your software captures the data. You generate reports. You send them to the client. The client pays. But where's the leak? Maybe it's here: your software requires so much manual setup that each new client onboarding takes 30 hours of team time. That's a resource leak. Your Value Proposition says fast results, but your Key Activities include a massive setup phase. Or maybe the leak's here: you're reporting monthly, but clients actually need weekly insights to make decisions. So they're not getting full value from your proposition, which means they're not willing to pay more or stay longer. Revenue leak. You won't see this if you just write the words. You have to trace the actual flow. The Canvas as a diagnostic tool I use the Canvas differently now. Not to plan new businesses. To fix existing ones. You already have a business model. It's running. It's just leaking somewhere. Take 90 minutes. Map what you actually do, not what you think you do. Then look at the connections. Find the places where value should flow but doesn't. Find the places where you're spending money to bridge a gap that shouldn't exist. That's where you fix it. What to do this week Draw your actual Business Model Canvas on a large piece of paper or a whiteboard. Not the pretty version. The real one. How money actually flows through your business right now. Then spend 15 minutes looking at each connection between boxes. Ask: is value flowing smoothly here, or are we losing something? Write down three specific things that feel off. Just three. Don't overthink it. Trust your gut. That's where the leaks are. Second: pick one leak and cost it. How much time, how much money, how much effort is being wasted on this misalignment? Get a number. Not a guess. An actual number. Once you can see the cost, you can decide if it's worth fixing. Third: if you're using ALIRA tools, run your business model through the 5 Whys tool on one of those gaps. Don't stop at the obvious answer. Keep going. The real cause of a leak is usually three layers deeper than you think.