About the Book: This second edition has been thoroughly revised and updated and efforts have been made to enhance the usefulness of the book. In this edition a new chapter The Computer : Its Role in Research have been added keeping in view of the fact that computers by now become a indispensable part of research equipment. The other salient feature of this revised edition, subject contents have been developed and restructured at several places. New problems have also been added in various chapters. Adoption of appropriate methodology is an essential characteristic of quality research studi