Once a startup knows current solutions aren’t working that well, the next step is to find out if people actually intend to buy the new solution. Instead of asking potential customers if they like the solution, a startup needs to get their non-binding buying intent. If no one is willing to commit to buying, that’s a warning flag. The time to pull the plug is now, before incurring the costs of building a product. During validation, it is tempting to start building something—but even building a prototype or wireframe should be part of the plan, to avoid the Overdo and Overspend iceberg drift.