Children are referred to the Montreal Oral School from Rehabilitation Centres, Hospitals, private audiology centres, pediatricians, other families and school personnel in the Montreal area. The services of the teachers of the hearing-impaired, audiologists, psychologist, social worker and technician are available free of charge to all children receiving MOSD services.

Children with hearing loss may begin to receive MOSD services at any age. During a diagnostic period, students are evaluated by the audiologist, an educator of the hearing-impaired and/or a speech and language pathologist and, in some cases, the psychologist. At this time the child's needs and abilities are identified. The family is fully involved with professionals in selecting an appropriate educational placement. The audiologists and psychologist may also provide assessment to some external clients, for which there may be charges.

Initial intake assessments of communication needs and abilities are carried out for the hearing-impaired school-aged children attending various school boards in the Montreal area whether or not the child eventually receives services from MOSD.