Information Systems (ISs) can be categorised differently by different class of experts. Based on these categories, Information System types include Transactional Processing Systems (TPSs), Management Information Systems (MISs), Decision Support Systems (DSSs), Executive Support Systems (ESSs) and Entreprise Resource Planning Systems (ERPSs). Using a firm of your choice with reference to various levels of management (operations, middle level & top management) in the firm of your choice, assess the use of TPSs, MISs, DSSs, ESSs and ERPSs in the firm and how they integrate (if they do at all).