An information system translates data into information to support business decision making. Data, raw unorganized facts, are gathered relative to a business event. The resulting information, which has meaning in the hands of a user, must be complete and accurate in order to support timely decision making. The acquisition of an information system by a small business will be a relatively costly endeavour. The small business manager will tend to rely upon an internal individual or external organization for advice when acquiring an information system. Further, the information system will be employed to improve the efficiency of daily operations of a small business. This chapter describes information systems. In general, an information system turns data into information to support decision making. The information must be timely, complete, and accurate relative to the decisions which must be made.