The invention relates to a method for fitting a hearing aid to the needs of a hearing aid user, the method comprising collecting statistical data characterizing physical or psychological properties of environments in which use of the hearing aid is desired and utilizing the statistical values for the adjustment of the signal processing in the hearing aid, such statistical data having influence even though they may have been collected prior to the wearer's first or current period of listening via the hearing aid. The invention further relates to a device for implementing the method.