This is an old direct marketing technique in which customers are given the opportunity to preorder a product that has not yet been built. A smoke tes… - Eric Ries

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This is an old direct marketing technique in which customers are given the opportunity to preorder a product that has not yet been built. A smoke test measures only one thing: whether customers are interested in trying a product. By itself, this is insufficient to validate an entire growth model. Nonetheless, it can be very useful to get feedback on this assumption before committing more money and other resources to the product.