A method of forecasting subjective efficacy of a hearing prosthesis implanted in a recipient, including subjecting a recipient to a plurality of temporally spaced aural training tasks, the aural training tasks evoking hearing percepts with the hearing prosthesis, obtaining first data indicative of the recipients ability to hear with the hearing prosthesis based on performance by the recipient of the temporally spaced aural training tasks, and forecasting second data based on the first data, wherein the second data are indicative of the recipients ability to hear with the hearing prosthesis at one or more temporal locations in the future.
