Longitudinal Graphic Analysis (LGA) is a powerful way to determine and document efficacy of treatments for chronic medical conditions frequently encountered in adults with disabilities, especially those with medically complex developmental disabilities (MCDD). The system of LGA can be useful for clinicians as well as administrators who wish to improve quality of health services for all persons with chronic conditions.

Neurodisabilities Medicine refers to the practice of the medical evaluation and management of adults with chronic brain dysfunction due to many different causes. There are certain concepts that have been found to be helpful in organizing the health professional clinical approch to these medically complex patients.