The 24-item Behavior and Symptom Identification Scale, BASIS-24®, is a leading behavioral health assessment tool designed to assess the outcome of mental health or substance abuse treatment from the client’s perspective. Typically, BASIS-24® is given at admission and discharge for inpatient or residential programs, and at intake/initiation of treatment and then periodically thereafter in partial hospital or ambulatory/outpatient care settings. Grounded in the latest scientific methods of survey development and validation, the BASIS-24® underwent extensive field testing as part of a multiyear research and development process and has been validated and found reliable in inpatient, residential, partial and outpatient settings. BASIS-24® is also validated in both Spanish and English.

BASIS-24® inquires as to the degree or frequency of difficulty that the respondent has been experiencing during the past week. The 24 items are scored using a weighted average algorithm that gives an overall score as well as scores for six subscales. The 24 items assess six major areas of difficulty and/or distress including: Depression/Functioning, Relationships, Self-Harm, Emotional Lability, Psychosis, and Substance Abuse.

BASIS-24® is designed for use by mental health providers, researchers, purchasers of mental health services, accreditation agencies, and internal quality assurance departments to measure the change in consumer self-reported symptom and problem difficulty over the course of treatment. BASIS-24® is not diagnosis-specific, but was designed to cut across diagnoses, acknowledging the wide range of symptoms and problems that occur across the diagnostic spectrum.

BASIS-24® Levels of Service


The BASIS-24® is a copyrighted survey available with three levels of service. A user can...

Level One: License the survey and use the scoring formula provided to do scoring independently

Level Two: License the survey and also add the WebScore scoring and reporting option (desktop or tablet) or

Level Three: License the survey and subscribe to the comprehensive eBASIS quarterly reports



Use of BASIS-24® requires an end-user license approved by McLean Hospital. In order to receive a license for BASIS-24 use, please compete an inquiry.  A member of the eBASIS team will contact you directly to provide more information on BASIS-24 license fees, services and agreements.