This document provides an overview of management information systems (MIS). It defines MIS as a computer-based system that presents both internal and external information to support decision making. MIS collects, processes, stores, and distributes data to managers. It assists rather than replaces managerial judgment. The document outlines the key components of MIS, including people, data processing, communication, planning, hardware and software. It also describes the functions, uses, benefits, and characteristics of effective information within an MIS.