By Carol Frank, managing director of SDR Ventures  and the author of, Do as I Say, Not As I Did! Gaining Wisdom in Business through the Mistakes of Highly Successful People.

As a long-time entrepreneur, I’ve endured my share of highs and lows in business. The analogy that running a business is a lot like being on a rollercoaster is dead on, as you never really know what direction work will take you. Throughout my topsy-turvy business journey, I’ve discovered five critical things an entrepreneur should never do.