After an accurate audiological result is obtained via Comprehensive Audiological Assessments, needy clients will be evaluated for the use of hearing aid. Hearing aids with different styles and technological levels are introduced according to the degree of hearing loss, lifestyle, communication needs and dexterity of the client. Comprehensive hearing aid verification will be performed to compare the aided and unaided performance of the client and regular follow-up service is necessary for maximizing the benefit of hearing aid.