Jataka Parijata (Ch. XVIII. Sl.58) states that in the beginning the mahadasa lord gives results in accordance with the house it occupies, in the middle, as per the sign it occupies, and at the close, as per the influence of the planetary aspects that improve or afflict the mahadasa lord. And, Mantreswara in his Phaladeepika explains that the gain or loss of things and the events signified by a particular bhava will be experienced when the lord of the lagna transits a trine from the natal position of the bhava-lord or the bhava-lord transits a trine from the natal point of the lagna, or when during the course of their transits they aspect each other or combine in a sign, or when the bhava-karaka transits the natal position of the lord of the lagna or the lord of the sign occupied by the Moon at the time of birth or when the lord of the lagna transits that bhava.Gopesh Kumar Ojha (1991), Phaladeepika Bhavarthabodhini, Motilal Banarsidas, New Delhi, India, p. 318.
