After you’ve tested a fully functioning prototype, it’s now time to do some market research. True market research is finding out what your customers want to buy and then catering your product line and marketing to their needs. What you think you want to sell is a shot in the dark; at worst case, it’s a gamble that could result in you sitting on inventory that no one wants to buy. Show your prototype to as many of your prospective customers as possible; you want to ask their opinion on your product’s quality, function, projected sales price, appearance, and how they’d like to see it packaged. Doing market research will enable you to assess how your product should be manufactured, packaged, and priced, and who the best customers will be to target your sales and marketing efforts to.