The Child Behavior Checklist (CBCL) is a standardized questionnaire that parents fill out to rate their child’s emotional and behavioral problems. Developed by Thomas Achenbach in 1966, it has become one of the most widely used tools in child psychology. The checklist comes in two versions, one for children ages 1.5 to 5 and another for ages 6 to 18, and it takes about 15 minutes to complete.
The CBCL is part of a larger framework called the Achenbach System of Empirically Based Assessment (ASEBA), which was designed to assess strengths and problems reported by parents, teachers, and youths themselves. If your child’s pediatrician or therapist has mentioned this checklist, here’s what it measures, how scoring works, and what the results actually tell you.
What the Checklist Measures
The version for school-age children (CBCL/6-18) contains 120 problem items and 20 competence items. The parent or caretaker who spends the most time with the child rates each problem item on a three-point scale: not true, somewhat or sometimes true, or very true or often true. The questions cover a broad range of behaviors, from withdrawal and fearfulness to rule-breaking and aggression.
Those 120 problem items feed into eight syndrome scales:
- Anxious/Depressed: worry, nervousness, fearfulness
- Withdrawn/Depressed: social withdrawal, lack of energy, sadness
- Somatic Complaints: headaches, stomachaches, and other physical symptoms without a known medical cause
- Social Problems: difficulty getting along with peers
- Thought Problems: unusual thoughts or behaviors
- Attention Problems: trouble concentrating, impulsivity
- Rule-Breaking Behavior: lying, stealing, skipping school
- Aggressive Behavior: arguing, fighting, destructive behavior
These eight scales then roll up into two broader categories. The “internalizing” score combines anxious/depressed, withdrawn/depressed, and somatic complaints, capturing problems a child turns inward. The “externalizing” score combines rule-breaking and aggressive behavior, capturing problems that show up as outward conflict. Social problems, thought problems, and attention problems sit between these two groupings.
Competence Scales: Measuring Strengths Too
The CBCL isn’t only about problems. Its social competence scale asks parents to report on the child’s hobbies, involvement with friends, and academic performance. This matters because a child who scores high on attention problems but is thriving socially and academically presents a very different picture than one who is struggling across the board. The competence scores give clinicians context that problem scores alone can’t provide.
How Scoring and T-Scores Work
Raw scores from the checklist are converted into standardized T-scores, which compare your child’s results to a large reference group of same-age, same-gender peers. The results fall into three ranges:
- Normal range: scores that fall below the 84th percentile
- Borderline clinical range: scores between roughly the 84th and 90th percentile for broad scales (internalizing, externalizing, and total problems) or the 93rd to 97th percentile for individual syndrome scales
- Clinical range: scores above the 90th percentile for broad scales or above the 97th percentile for individual syndromes
A score in the borderline range means the behavior is elevated enough to warrant attention but not clearly in problem territory. A score in the clinical range means the child is reporting significantly more problems than most peers, and further evaluation is typically the next step. It’s worth noting that the thresholds are intentionally different for the broad scales and the individual syndrome scales, so your clinician may walk you through both sets of numbers.
DSM-Oriented Scales
In addition to the eight syndrome scales, the CBCL includes scales that align with common diagnostic categories: mood disorders, anxiety, ADHD, oppositional defiant problems, and conduct problems. These scales don’t diagnose anything on their own, but they flag patterns that overlap with recognized conditions. In a large study of Chinese school-age children, these scales showed fair diagnostic accuracy across all five categories, with mood disorder detection performing best. The overall reliability of these scales was strong, with an internal consistency score of 0.92.
What the CBCL Can and Can’t Do
The checklist is a screening and assessment tool, not a diagnostic test. It tells a clinician where to look more closely. A high score on the attention problems scale, for example, doesn’t mean a child has ADHD, but it signals that a formal evaluation for attention difficulties would be worthwhile.
Research has specifically examined whether the CBCL can identify autism spectrum disorder. The answer is no, it’s not sensitive or specific enough to serve as an autism screener. However, children with autism often show elevated scores on the social problems, withdrawn, thought problems, and attention problems scales. Those patterns can prompt a clinician to pursue further assessment. Where the CBCL does prove useful for children already diagnosed with autism is in tracking co-occurring behavioral and emotional problems, which are common in that population and often need their own treatment.
The checklist also has a practical limitation built into its design: it captures one informant’s perspective. The parent who fills it out may see different behaviors than a teacher or the child themselves would report. That’s why the broader ASEBA system includes parallel forms for teachers and for older children to complete about themselves. When scores from multiple informants are compared, clinicians get a much richer picture of where problems are consistent across settings and where they’re situation-specific.
Who Fills It Out and When
The CBCL is completed by the parent or caregiver who spends the most time with the child. It’s typically given during an initial evaluation for behavioral or emotional concerns, but it’s also used to track changes over time, for instance before and after a course of therapy. Researchers use it frequently in studies on childhood mental health, making it one of the most cited instruments in the field.
The form takes about 15 minutes to fill out. You don’t need any special training to complete it, though scoring and interpretation are handled by a licensed professional. The manual has been updated periodically since its original 2001 publication, with revisions in 2007, 2013, 2015, and a 2021 update that incorporated nonbinary gender options.
What to Expect From the Results
If your child’s clinician uses the CBCL, you’ll typically receive a profile that shows each syndrome scale plotted against the normal, borderline, and clinical thresholds. Some scales may be elevated while others are well within the normal range, and that pattern itself is informative. A child with high internalizing scores and low externalizing scores, for example, may be quietly struggling with anxiety or depression in ways that aren’t obvious at school or at home.
The results are one piece of a larger evaluation. Clinicians combine CBCL scores with clinical interviews, observations, and sometimes other standardized tests to build a complete picture. If your child scores in the clinical range on one or more scales, it doesn’t mean something is “wrong” with them. It means there’s a measurable pattern that deserves closer attention, and it gives everyone involved a shared language and baseline for tracking progress.