This book aims to provide knowledge on role and significance of Management Information Systems and Marketing Information Systems in contemporary business organisations. The book includes explanation of the information systems genesis and generations, presentation of a development of different types of information systems, i.e. Transaction Processing Systems, Integrated Information Systems, Decision Support Systems, Expert Systems, Executive Information Systems, Marketing Information Systems and explanation of their significance in organisational strategy development. In the book authors give general principles of designing and implementation of information systems, present actual methods of business information system development.