43. (a) State two main features of each of the following systems. (i) Management Information System (MIS) (ii) Office Automation System (OAS) (iii) Transaction Processing System (TPS) (2 mks) (2 mks) (2 mks) (b) Outline four major components of an information systems project plan. (4 mks) (c) Explain the use of the following techniques in project management. (i) Network diagrams (2 mks) (ii) Gantt charts (2 mks) (d) Explain three project management tools that can be used to control project risk. (6 mks) 44. (a) Explain four reasons that may necessitate a system change. (8 mks) (b) Describe how an organisation can use information systems to create new products and/or services. Give one example. (6 mks) (c) Explain three types of maintenance that can be carried out on an existing information system. (6 mks)