Your already a certified diving instructor and have been teaching for awhile, or maybe a dive master who figures it's time to get a better understanding of the business side of the industry, whatever your reason this is one great book for your reference library. Get a grip on what the business is all about. Great to help you decide on what business classes you may need to become efficient as small business owner. PADI's The Business of Diving is a guide to the success in the recreational dive industry.