The book is strictly written as per syllabus framed by PCI under Section 6, 7 and 8 of Regulation 2014 and we had made an attempt to make it simple and understandable to the readers. The sequence of syllabus content is designed unit wise imparting better understanding of subject matter. In this book wherever needed full forms and abbreviations, pictorial diagrams, tabular data, examples are given. Model questions are given at the end of every subunit to exercise on contents studied.