Astrology can be considered a useful branch of knowledge only if its concepts and principles could be applied to assess the personality and life of a person and to look into the years ahead to tell him as to what is in store for him. An attempt has been made in this work to clarify the concepts with regard to the Signs, Planets and Houses in simple and readable language. These are the building blocks of the foundation on which an edifice of sound analytical knowledge of predictive astrology may rest. What each of these factors represents, what its characteristics are and what the postulates and rules are relating to each of them have been clearly enunciated. Further the results and effects of interaction of these factors have also been brought out in sufficient detail. To keep the bulk of the work within limits, generally definitions and commonly known or found facts have been dispensed with. Thus, this is not a primer. It is meant for a person who, having found the subject interesting and obtained its elementary knowledge, wishes to delve deeper in it in a systematic manner.