This document summarizes key aspects of management information systems (MIS), including definitions of MIS and different types of MIS. It discusses how MIS is useful for companies in planning, control, and decision making. Examples of companies that use MIS are provided. The impacts of MIS on organizations are that it facilitates flattening of hierarchies, increases speed of decision making, and empowers lower-level employees. MIS provides strategic information to management to make competitive decisions and transform organizations.