What is the SRS-2? The Social Responsiveness Scale, Second Edition explained

The SRS-2 (Social Responsiveness Scale, Second Edition) is a 65-item standardized rating scale that measures social communication traits associated with autism, published by Western Psychological Services (WPS) in 2012 and authored by psychiatrist John N. Constantino, MD. A parent, teacher, or other adult who knows the person well completes the questionnaire in about 15 to 20 minutes, and an adult self-report form is also available. Forms cover ages 2 years, 6 months through adulthood. Rather than sorting people into a yes-or-no category, the SRS-2 treats social behavior as a quantitative dimension, and clinicians use its scores as one piece of evidence within a comprehensive autism evaluation. On its own, it is not a diagnostic test. This article explains what the SRS-2 measures, how its forms and scores work, what its subscales mean, and where it fits alongside other assessments.

The SRS-2 measures "reciprocal social behavior," meaning the natural back-and-forth of everyday social interaction: noticing social cues, interpreting them accurately, responding to other people, and sustaining conversation and shared activity. It also asks about restricted interests and repetitive behaviors, the second core feature of autism as defined in diagnostic manuals. The publisher describes the instrument as a way for parents, teachers, and others to rate behaviors they have observed over time in natural settings such as home and the classroom, using a graduated response scale that captures a range of intensity rather than a simple present-or-absent judgment.

That dimensional design reflects research by the scale's author. In a 2003 twin study published in the Archives of General Psychiatry, Constantino and Todd administered the original Social Responsiveness Scale to the parents of 788 twin pairs aged 7 to 15 and found that autistic traits were continuously distributed across the general population and were moderately to highly heritable. In other words, social communication traits vary along a continuum in the whole population, much like height or reading ability, and the SRS-2 is built to measure where an individual's rated behavior falls on that continuum. This framing is deliberately respectful of the science: autism involves real differences in social communication, and those differences shade gradually into the typical range rather than forming a sharp natural boundary.

According to the publisher, the SRS-2 offers four forms, each with the same 65-item length and a completion time of about 15 to 20 minutes:

• Preschool form: for ages 2½ to 4½, completed by a parent or teacher.

• School-age form: for ages 4 through 18, completed by a parent or teacher; this form uses the same items as the original SRS.

• Adult form: for ages 19 and up, completed by a relative or friend who knows the person well.

• Adult self-report form: for ages 19 and up, completed by the individual.

Because the forms span from age 2 years, 6 months through adulthood, clinicians can use the SRS-2 to track social communication traits across the lifespan and to gather ratings from more than one observer, for example a parent and a teacher who see the same child in different settings. In a 2020 study in Autism & Developmental Language Impairments, Channell notes that raters respond to each item on a four-point scale describing the person's behavior over the preceding six months. Purchasing and interpretation are restricted: WPS lists the SRS-2 at qualification Level C, which generally means a professional with advanced training in psychological assessment must supervise its use and interpret the results.

The SRS-2 reports results as "T-scores," a standard score metric with a mean of 50 and a standard deviation of 10. Higher scores indicate more frequent or more noticeable social communication challenges as reported by the rater; lower scores indicate fewer. The publisher reports that norms are based on a national sample of 1,906 individuals contributing 4,709 ratings, representative of the United States population with regard to gender, ethnicity, education, and geographic region, with separate norms by form, rater type, and the age and gender of the person being rated.

Researchers commonly describe the total T-score using interpretive ranges. In the study cited above, Channell summarizes the conventions used with the SRS-2: scores below 60 fall within the typical range, scores from 60 to 65 fall in a mild range, scores from 66 to 75 fall in a moderate range, and scores of 76 or higher fall in a severe range. Two cautions are worth stating plainly. First, these labels describe scores, not people; a "moderate" score summarizes how a rater described observable behavior, and it says nothing about a person's character, effort, or potential. Second, like every score based on a rating scale, an SRS-2 T-score contains measurement error and reflects one rater's perspective, which is why professional guidelines call for multiple sources of information before drawing conclusions.

Beyond the total score, the publisher reports that the SRS-2 generates five treatment subscales:

• Social awareness: picking up on social cues in the first place.

• Social cognition: interpreting social cues once they are noticed.

• Social communication: expressive social communication, the "output" side of reciprocal interaction.

• Social motivation: the degree to which a person is motivated to engage in social interaction.

• Restricted interests and repetitive behavior: stereotypical behaviors and highly restricted ranges of interest.

WPS states that these subscales are not used for screening or diagnosis; their purpose is to help clinicians design and evaluate intervention programs by showing where support may help most. The SRS-2 also offers two subscales aligned with the two symptom domains in the DSM-5, the current edition of the American Psychiatric Association's diagnostic manual: Social Communication and Interaction, and Restricted Interests and Repetitive Behavior. According to the publisher, these scores make it easier to compare a person's reported traits with current diagnostic criteria for autism spectrum disorder. Supporting evidence extends into adulthood: in a 2017 validation study in Autism Research, Chan and colleagues found that SRS factor scores organized along DSM-5 lines showed concurrent, convergent, and discriminant validity in a sample of 237 autistic adults.

The SRS-2 is a well-normed quantitative measure, and it appears constantly in autism research as a way to quantify trait severity and measure change. In clinical practice it contributes to evaluations, helps document response to intervention, and captures how behavior appears in daily settings that a clinician never observes directly. What it cannot do, alone, is diagnose anyone. The Centers for Disease Control and Prevention notes that there is no medical test for autism and that a screening or rating tool by itself does not provide a diagnosis; a formal evaluation by trained specialists such as a developmental pediatrician, child psychologist, or speech-language pathologist is required. The American Academy of Pediatrics' 2020 clinical report on autism takes the same position, describing diagnosis as the outcome of a comprehensive evaluation that integrates developmental history, direct observation, and standardized testing.

It also helps to know where the SRS-2 sits among related tools. For toddlers, pediatricians typically begin with a brief parent screener at the 18- and 24-month visits; our article on the M-CHAT explains how that first-stage questionnaire works. A full evaluation usually also measures everyday functioning with an adaptive behavior measure such as the Vineland-3, along with cognitive and language testing. The SRS-2 adds something the others do not: a normed, dimensional reading of social communication traits from multiple observers' points of view.

A high SRS-2 score says nothing about a person's reasoning ability, and an IQ score says nothing about a person's social communication traits. Autistic people span the entire range of intellectual ability, from intellectual disability to intellectual giftedness, a point covered in more depth in our article on IQ and autism. Because the constructs are distinct, a thorough evaluation measures them separately, and no social responsiveness questionnaire can substitute for a cognitive test or the reverse.

For adults who want a rigorous measure of the cognitive side, the Reasoning and Intelligence Online Test, developed by RIOT IQ with psychometrician Dr. Russell T. Warne, measures reasoning ability in adults 18 and older through 15 subtests across six cognitive indices: verbal reasoning, fluid reasoning, spatial ability, working memory, processing speed, and reaction time. It takes about 52 minutes and reports scores on the familiar mean-100, standard-deviation-15 IQ scale. Like the SRS-2, it is one well-built instrument with a defined job; it does not replace an individually administered diagnostic evaluation, and nothing about an IQ score speaks to autism one way or the other. You can take the RIOT IQ test online.

It is a standardized rating scale that quantifies social communication traits associated with autism. It contributes evidence to an evaluation, but no rating scale result is a diagnosis; only a comprehensive evaluation by qualified professionals can determine whether someone meets criteria for autism spectrum disorder.

Forms span ages 2 years, 6 months through adulthood: a preschool form (2½ to 4½), a school-age form (4 to 18), and two adult forms (19 and up), one completed by someone who knows the person and one completed as a self-report.

Each form contains 65 items and takes about 15 to 20 minutes to complete, according to the publisher.

Results are reported as T-scores with a mean of 50. Research convention treats total T-scores of 59 or below as within the typical range, 60 to 65 as mild, 66 to 75 as moderate, and 76 or higher as severe. These ranges describe scores from one rater's report, not fixed qualities of a person.

The SRS-2 was authored by John N. Constantino, MD and published by Western Psychological Services in 2012. The accompanying research literature typically cites the manual as Constantino and Gruber, 2012.

No. It measures reported social communication traits. Intelligence is a separate construct measured by cognitive tests, and autistic people can score anywhere on the IQ scale.

1. Western Psychological Services. (n.d.). (SRS-2) Social Responsiveness Scale, Second Edition.. wpspublish.com

2. Constantino, J. N., & Todd, R. D. (2003). Autistic traits in the general population: A twin study. Archives of General Psychiatry, 60(5), 524-530. doi.org

3. Channell, M. M. (2020). The Social Responsiveness Scale (SRS-2) in school-age children with Down syndrome at low risk for autism spectrum disorder. Autism & Developmental Language Impairments, 5. doi.org

4. Hyman, S. L., Levy, S. E., & Myers, S. M. (2020). Identification, evaluation, and management of children with autism spectrum disorder. Pediatrics, 145(1), e20193447. doi.org

5. Centers for Disease Control and Prevention. (n.d.). Diagnosis of autism spectrum disorder.. cdc.gov

6. Chan, W., Smith, L. E., Hong, J., Greenberg, J. S., & Mailick, M. R. (2017). Validating the Social Responsiveness Scale for adults with autism. Autism Research, 10(10), 1663-1671. doi.org

Photo by Jernej Furman, via Wikimedia Commons (CC BY 2.0)