The operator's lens: the four-stage growth machine

The two models above are excellent maps, but neither is shaped like a lean founder's week. The Solid Growth machine is: demand and lead generation, then lead activation, then sales pipeline, then revenue per client. Each stage maps directly onto where you actually spend time, and onto an owning playbook, so the model is not just a way of thinking but a way of dividing the work. This is the operator lens, and it is the one I build on, because a model you can act on beats a model you can only admire. You can see the growth machine end to end laid out as one connected system rather than four disconnected funnels.

The deeper point is that these are switchable lenses, not rival religions. Solid Growth is built so you pick the model in software, the four-stage machine, the bowtie, or the pirate funnel, before you configure a single funnel-stage tactic. The shape you see decides the numbers you optimise; choosing it deliberately is the whole game. The three models are not competing for your loyalty; they are three resolutions of the same underlying journey, and the right one is simply the one whose shape matches where your growth currently lives.

The four-stage machine earns its keep because each stage has a clear owner you can hand to yourself or an agent. Demand and lead generation is where channel selection and demand work live. Lead activation is where onboarding and the magic-number engineering belong. Sales pipeline is where your go-to-market strategy and pipeline tactics sit. Revenue per client is where customer retention and lifetime-value work compounds. Once the model names this quarter's bottleneck, you know which playbook to open, and the others wait their turn rather than competing for your scarce attention. The same logic governs how you run a growth operating system as a whole: name the stage, point everything at it, sequence the rest behind.