Regarding "which best describes how you validated your original business idea?", is anyone aware of more research around the effectiveness or practicality of different validation approaches? That is, rough false-positive (validation indicated that business idea had sufficient market demand when it didn't) and false-negative rates (validation indicated that business idea had insufficient market demand when it did) for different validation approaches.<p>Naively it'd be great to have data of the form "given our idea for a business was bad specifically because there would be insufficient market demand, when we validated the idea by method A (e.g. getting verbal commitment from n potential customers), validation result indicated there was enough market demand to proceed, we decided to proceed, but the business failed later specifically for a reason that the validation approach was intended to measure (customers willing to buy the service) and not for some other reason". I.e. known ground-truth, measurement, measurement result, decision to proceed or abort based on measurement result, actual outcome.<p>Probably would be a very tricky thing to isolate the effectiveness of the validation approach and tease it apart from other confounding factors.