This book has been envisioned keeping in view the present needs of the students. The content and layout of the book seeks to foster both understanding and application skills of the students. Relevant case studies with solutions have been included to enhance the competency of the students in the subject. This will help them to understand and attempt case study based questions easily. Flowcharts and mind maps have been provided in each chapter to facilitate visual learning and serve as a useful tool in revising the key concepts. Solutions to NCERT questions have also been provided for all the chapters and the teachers. I am hopeful that the book serves as a ready reckoner for both the students and the teachers. Wishing all the readers a success in their future endeavours.