The book has been written in simple English without heavy technical jargons with the aim to provide readers with a book that will deliver key practical information in an efficient and effective manner and explain each topic in such a way that even someone without any health background can follow the subject and understand practical issues. It is ideal for readers with basic knowledge of research as well as for those with intermediate knowledge who need a quick refresher regarding various aspects of the research methodology. For readers with an advanced knowledge of research-design and methodology, this book can be used as a concise summary of basic research techniques and principles, or as an adjunct to a more advanced research methodology textbook.