The book of Yamaka examines and explains the phenomenal states of different individuals by using pairs of catechisms through direct and inverse formulation in dual groupings, and continue in three categories of measurement. Because of the massive textual contents, this book is compiled as Volume I by examining the first five of the ten chapters. Chapter 1 clarifies the fundamental differences in the Abhidhamma terminology such as roots, root-conditions, states, causes. The subsequent four chapters deal with the clarification of terms, the arising and cessation of specific phenomenal states, and gauging the aspect of comprehension in topics on aggregates, bases, elements, and truths. Many expositive examples, along with more concrete answers are provided in this analysis. Three appendices over and above a total of 92 charts and diagrams, are composed with clear-cut illustrations to assist readers in the studying of this book.