Age-related hearing impairment hearing aid digit symbol substitution test (DSST) convoy model hearing handicap inventory for the elderly (HHIE) a b s t r a c t Objectives: To obtain new insights into research questions on how executive function and social interaction would be observed to change after the introduction of hearing aids (HAs) in older people with hearing impairment. Design: Multi-institutional prospective single-arm observational study. Setting and Participants: Outpatients with complaints of hearing difficulty who visited HA clinics between October 18, 2017, and June 30, 2019, in 7 different university hospitals in Japan. Methods: The inclusion criteria of the study named Hearing-Aid Introduction for Hearing-Impaired Seniors to Realize a Productive Aging SocietydA Study Focusing on Executive Function and Social Activities Study (HA-ProA study) were age !60 years and no history of HA use. A series of multi-institution common evaluations including audiometric measurements, the digit symbol substitution test to assess executive functions, convoy model as an index of social relations, and hearing handicap inventory for the elderly (HHIE) were performed before (pre-HA) and after 6 months of the HA introduction (post-HA). Results: Out of 127 enrollments, 94 participants completed a 6-month follow-up, with a mean age of 76.9 years. The digit symbol substitution test score improved significantly from 44.7 at baseline to 46.1 atThe funding sources had no role in the study design or conduct of the study; in the collection, management, analysis, or interpretation of the data; in the writing of the manuscript; or the decision to submit.