It's not a product management tool. There are lots of great options to help you do that, some of which I use. If you already have an idea that you think is a f

It's not a product management tool. There are lots of great options to help you do that, some of which I use. If you already have an idea that you think is a fact, and you are going to build it, regardless of what the world says, then you needn't write anything down. That's what most failed projects do/did. The canvas is meant to help when you see your ideas as hypotheses. You document them, and then you go try to find out if they're true or not (by talking to customers, building MVPs, watching mailing lists, whatever). If everything is true, you move on to scaling the business. If some of your initial beliefs turn out to be false, which is probable, then you have a place to go back and document your new learning, and hopefully see how that change will impact the rest of your assumptions.