A Startup Does Not Make Software. It Makes Case Studies.
Snyder says find one customer who "pulls the product out of your hands" and uses it as if addictive, then repeat that story.

Lenny's Podcast: Product | Career | Growth · An 86-minute guide to finding PMF | Rob Snyder (Author, The Power of Pull)Rob Snyder, author of The Power of Pull, was explaining how founders should think about growing a young company when he said what came next was the most important thing in the whole process.
He put it this way: "We don't make software here. We make case studies."
By that, Snyder argues, a startup is not a bunch of different things. It is a factory built to repeat one success an endless number of times. The founder's job, in his view, is not to collect a hundred different customer stories but to create one story in which a customer says hell yes, and then build everything around repeating it.
That one story has a shape Snyder describes in plain terms. A person was trying to do X, existing options were not good enough for Y, and the startup offered Z that unblocked them. Snyder believes the test is simple. The customer pulls the product out of the founder's hands before buying, and then uses it as if it were addictive afterward.
He divides the factory into three steps. Pipeline means getting the right people to talk to you. Sales means turning those prospects into paying customers. Delivery means getting customers to what he calls "weird not to churn," meaning it would be strange for them to leave.
Snyder borrows an idea from manufacturing, called the theory of constraints, to run the factory. The founder looks for the single bottleneck that is slowing growth, fixes only that bottleneck, and then moves to the next one. If pipeline is thin, nothing else matters. If deals are not closing, that is where all attention goes.
Sales, in this model, becomes a matching exercise. Snyder says it becomes telling a prospect, "This is the case study that we deliver on. Is this relevant to you or not?" If a prospect does not resemble that story, he says you can tell them, "You don't look like our case study," since, in his words, "it's probably going to be a lot of work and it might not be a good fit."
You do not even have to publish the case study, Snyder says. It is a mental model for focus. Your perfect customer, what he calls a hell yes customer, is, in his words, "weird not to buy and weird to churn." As he puts it, "Your job is just to find more who are basically clones of them."
Questions people ask
Do you actually have to publish the case study?
No. Snyder treats it as a mental model for focus, not a marketing asset. The point is to make every deal follow the same path from first talk to successful use, so you can tell quickly whether a prospect fits and where growth is stuck.
How do I know which part of my factory is broken?
Look at where prospects stall. If you cannot get enough of the right people to talk to you, pipeline is the bottleneck. If talks do not turn into purchases, sales is. If customers buy but fade away, delivery is. Work only on the narrowest point until it moves.
What is the difference between a happy customer and a hell-yes customer?
Snyder does not define a merely happy customer. He defines hell yes as pulling the product out of your hands before buying and then using it as if it were addictive. As I read him, a customer who likes the product but does not buy with urgency or use it heavily would not meet his test.