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What Not to DoA seasoned entrepreneur reveals the 17 most common mistakes startups make and how to avoid them -- plus, the 5 things you must do to ensure success.

ByMark Henricks

Opinions expressed by Entrepreneur contributors are their own.

John Osher has developed hundreds of consumer products, including an electric toothbrush that became America's best-selling toothbrush in just 15 months. He also started several successful companies, including Cap Toys. He built sales to $125 million per year and then sold the company to Hasbro Inc. in 1997. But his most lasting contribution to the business world just may be a list of screw-ups he jotted on the back of a piece of paper.

"After I sold my business to Hasbro, I decided I'd make a list of everything I'd done wrong and [had] seen other entrepreneurs do wrong," explains the 57-year-old Jupiter, Florida, serial entrepreneur. "I wanted to make a company that didn't make any of these mistakes. I wanted to see if I could come up with the perfect company."

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