Very important. Of course I say that from the perspective of someone who has worked in the medical field for over three decades and been involved in recent years with disaster management planning. I think all businesses need to plan for the unexpected - sudden illness and injury of workers, workplace hazards and safety, and yes, disasters. The planning needs to be appropriate to the business, types of employees, geographical location and types of potential emergencies, function of the business and interrelatedness with community organizations. For example, the simplest most basic plan needs to include a communication system, a phone tree system and measures to be taken in the event of various natural disasters such as tornadoes and floods, and man-made disasters such as train wrecks, plane crashes and chemical spills. And don't forget about including a plan for computer crashes! You need to have a back-up paper system!