This book goes into the intricacies of the vimsottari and other Nakshatra based planetary dasa (udu dasa) to bring out their need & usage. An independent chapter is devoted to the choice of dasa,the how & why of choosing the right dasa for a chart while considering the various criteria as well as variation options in a step by step approach.Judgement of dasa includes the principles, in general used for reading the message of the charts & in timing the events that the drama of life shall show.