To design computer-based information systems so as to provide an aid to management - is the need of the day. This text, in its second edition, continues to provide a lucid and self-contained presentation to the students on how to analyze and design information system to run a sound organization. Apart from the tools used in designing information systems, data flow diagrams, and decision tables, the new edition incorporates two new chapters on Object-orientation Modelling and E-Commerce – to reflect the rapid changes taking place in designing information systems. Primarily intended for the undergraduate and postgraduate students of computer science and engineering and information technology, this book is also beneficial for the students appearing for DOEACC (Level A) examination.