This book is written with two objectives. First, to emphasise that the subject matter of Jyotish as described by Parasara, Varaha Mihira and others is to decipher the Karma Phala (Luck) of the native that is the effect of an individual's actions done in past life. It is similar to cause and effect theory applicable in physical sciences. This effect is not "caused by relative positions of the Moon, Sun and Stars" as given in English Dictionaries. Three constant factors used as tools are the seven planets of the solar system, 28 Nakshatras and Langa as described in Vedanga Jyotish. The traits of planets are symbolically derived from Vedic Mantras recited in performance of Yajnas. Proper references from Vedas are given. Similarly, significations of Bhavas are symbolically adopted from 'Jyotish Bhavachchbhav' Sutras of Brahma-sutras. Variable factors are not fixed. These are 12 as per Yavana. Second objective is to present relevant data at one place featuring in ten texts, viz., Brihat Parasara Hora Sastra, Brihat Jataka, Saravali, Sarvartha Chintamani, Jataka Parijata, Maan Sagari Paddhati, Jataka Sara Deepa, Phala Deepika, Hora Ratnam and Phalit Vikasa, under study with proper references. A sincere effort has been made for reconcilling conflicting views. Thus the book is ten-in-one study-first of its kind in predictive astrology in modern times. The reader will have the benefits of ten classical texts logically interpreted and arranged in this book. Offering him principles of Dasa analysis and interpretation leading to various effects and events in life.