Provides extensive case management services, outpatient treatment, twenty-four hour telephone emergency service, partial hospital program, deaf partial hospital program, training and social/rehabilitation programs, vocational services, and many levels of supervised residential living supports for individuals with a mental health and/or intellectual disability diagnosis. Milestone also oversees the operation of two Health Care Quality Units (an initiative of the Office of Developmental Programs) that provide training and technical assistance to residential providers in western and northern Pennsylvania. Currently Milestone operates in twenty counties in western Pennsylvania.