To test for genuine 'pull,' a founder should challenge a prospect's need rather than sell to it. By asking questions like, 'Why can't you just do this with your existing options?' you force the prospect to articulate why their problem is urgent and unsolvable. This 'leaning back' approach makes high-intent buyers sell you on their problem.

Most problems customers describe are "pain points" they won't act on. You can't distinguish these from real, actionable demand ("pull") through interviews alone. The only true test is presenting a viable solution and attempting to sell it. Their reaction—whether they try to pull it from you—is the only reliable signal.

Eliminate the "send me a proposal" stall by defining the next step as a valuable, paid engagement, like a diagnostic or workshop. By charging for this, you force the money conversation early, filter for serious buyers, and avoid creating free documentation that can be shopped around.

Free offers attract high volume but often low quality. Counter this by adding strategic friction—like multi-step forms or forced video consumption—to weed out uncommitted prospects. The goal is finding the sweet spot that maximizes qualified leads without losing high-value but lazy prospects.

Don't confuse customer enthusiasm or agreement with genuine buying intent ('pull'). Real pull is when the customer proactively initiates the next step in the sales process. Words like "this would solve our pain points" are not actions and often create false positives in the pipeline.

Utilize the 'investment principle': prospects are more likely to see a deal through if they've invested significant time and effort. Instead of providing a proposal after one meeting, structure a multi-step process that requires their participation. This makes the deal more meaningful and weeds out unserious buyers who are unwilling to commit their own resources.

Since "blocked" demand is unobservable, you must ask questions that reveal it indirectly. Asking "If I spent $100M to build something for you, what problem would it solve?" forces customers to consider their most critical, unaddressed needs, bypassing their current behaviors and revealing latent demand.

Asking "Would you buy this?" is too easy. A true signal of interest comes when a potential customer commits something of value: time as a design partner, an introduction to investors, or signing a letter of intent. These actions have a cost, making their "yes" meaningful.

While legally non-binding, asking for a Letter of Intent (LOI) serves as a powerful commitment test. The friction of reviewing and signing a document separates genuinely interested prospects from those who are merely curious.