The Proof-of-Concept Trap

A proof of concept proves the technology works. It does not prove anyone will pay for it. Confusing those two has killed more products than bad code ever has.

I've led a lot of POCs — building risk-scoring and software prototypes, running B2B prospecting, testing whether an idea had a market. Early on I made the classic mistake: I treated the demo as the finish line. Build something impressive, walk into the room, watch heads nod. The nods felt like validation. They weren't.

Here's the trap. A great demo tests whether you can build the thing. It says almost nothing about whether the customer will reorganise their budget, their process and their habits to actually use it. “This is amazing” and “here's a signed order” are separated by a chasm that no amount of polish crosses.

A few things I learned the expensive way:

1. Applause is not a buying signal. The people who love a demo are often not the people who control the budget. Enthusiasm in the room and willingness to pay live in different rooms entirely.

2. The riskiest assumption is almost never technical. It's “will they pay, and change their workflow to do it?” So the smallest useful POC isn't the most impressive build — it's the one that tests that question fastest, even if it's ugly.

3. The real proof of concept is a customer who commits something they can't easily walk back — budget, a pilot with success criteria, a signature. Everything before that is a rehearsal.

The most dangerous phase of building anything is right after a demo goes well. That's when teams mistake being impressed for being sold, and pour months into scaling something no one has actually agreed to buy.

Build the demo, yes. But treat the applause as a question, not an answer: great — now will you pay for it?

What's the clearest signal you've found that separates real demand from polite enthusiasm?