Effectual

[Sarah]

Producing, or having adequate power or force to produce, anintended effect; adequate; efficient; operative; decisive. Shak.Effectual steps for the suppression of the rebellion. Macaulay.Effectual calling (Theol.), a doctrine concerning the work of theHoly Spirit in producing conviction of sin and acceptance ofsalvation by Christ, -- one of the five points of Calvinism. SeeCalvinism.

[Greta]

effective and successful:

[GarryDrold]

(of something inanimate or abstract) successful in producing a desired or intended result; effective.