Books on management are published by the hundreds each year, but for your money you can skip a great deal of these publications and simply re-read Peter F. Drucker, who will always be the Shakespere of the genre. The past few years have seen the downfall of one once-dominant business after another: General Motors, Sears and IBM, to name just a few. In every case the main cause has been at least one of the five deadly business sins, which undoubtedly will harm the mightiest business. Take a look and see how your business is doing?