Paeds · investigations-procedures-and-technology
Developmental, cognitive and behavioural assessment tools
Also known as Developmental screening · Cognitive assessment · Bayley Scales · Ages and Stages Questionnaire · M-CHAT-R/F · Strengths and Difficulties Questionnaire · Developmental surveillance
A fellowship approach to the developmental, cognitive and behavioural assessment tools used across childhood, built on the single principle that surveillance, screening and diagnostic assessment are three different acts answering three different questions. Surveillance is the longitudinal, opinion-based monitoring done at every health visit. Screening is a brief, standardised tool applied to the whole population at scheduled ages to find the child who needs a closer look. Diagnostic assessment is the lengthy, trained-administered evaluation that confirms and quantifies a disorder. Hold the schedule of developmental screen at nine, 18 and 30 months and autism screen at 18 and 24 months, layered on surveillance at every visit. Know the broadband developmental screens (Ages and Stages Questionnaires, Parents' Evaluation of Developmental Status, Denver II), the gold-standard cognitive tools (Bayley, Griffiths, Wechsler), the autism screen (M-CHAT-R/F, CHAT) and the behavioural scales (Strengths and Difficulties Questionnaire, Child Behavior Checklist, Vanderbilt, Conners). Hold the psychometric model: standard score mean 100, standard deviation 15, a score of 70 or below two standard deviations below the mean; developmental quotient equals developmental age divided by chronological age times 100. A positive screen is never a diagnosis; low prevalence lowers positive predictive value, so diagnostic confirmation always follows. Always check hearing and vision, because sensory impairment is the reversible mimic, and escalate regression or loss of any skill to urgent diagnostic referral.
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Target exams
Red flags
- Regression or loss of any acquired language, social or motor skill — this is never a normal variant and demands urgent diagnostic developmental and autism assessment plus audiology, not a repeat screen at the next visit
- No pointing, joint attention or social engagement by around 12 to 15 months, or no words by 18 months — perform an M-CHAT-R/F and refer for diagnostic autism assessment rather than reassuring the family
- A screen-negative child whose parent remains concerned — the parent knows the child best, so a persistent concern still warrants referral even when the score is in the pass range
- Relying on informal clinical impression alone — it misses more children than a structured screen and is the commonest reason a developmental disorder is detected late
- Sending a child for cognitive assessment before hearing and vision are checked — sensory impairment is the reversible mimic of developmental and behavioural delay
- Treating a positive screening test as a diagnosis — in a low-prevalence population the positive predictive value is modest, so diagnostic confirmation with a gold-standard tool must always follow
Life stages
Care settings
Clinical exam formats
Board mappings
- General and Community Paediatrics
- Developmental surveillance, screening and the selection of assessment tools
- Child development and behaviour; interpretation of standard scores and cognitive assessment
- Clinical Applications
- Medical Sciences
- Developmental and behavioural screening and diagnostic assessment
- Short Cases
- Structured oral on a child with developmental delay, suspected autism or behavioural concern
- 2.4 Uses information for clinical decision-making
- 1.4 Safely performs and interprets developmental and behavioural assessments
- 8. Patient safety
- Foundation of Practice (FOP)
- Applied Knowledge in Practice (AKP)
- Development station; history and management of a child with developmental delay
- General Pediatrics Content Outline — Development and Behaviour; screening and diagnostic assessment
- Universal Task 4: Management and Treatment
- Patient Care 1: developmental surveillance, screening and referral
- Systems-Based Practice
- Medical Expert
- Communicator
- Collaborator
Overview & Definition
Picture an eighteen-month-old whose mother says he has no words and does not point. Your job is not to label him at the desk; it is to choose the right instrument for the right question, and to know what its number means. That choice — and the honest interpretation that follows — is what this topic tests. [1]
The single idea that holds the whole topic together is that surveillance, screening and diagnostic assessment are three different acts. Surveillance is the longitudinal, opinion-based monitoring you perform at every health contact: you take the history, observe the child at play, elicit the parent's concerns, and follow the trajectory over time. Screening is a brief, standardised tool you apply to the whole population at scheduled ages, whether or not anyone is worried, to find the child who needs a closer look. Diagnostic assessment is the lengthy, trained-administered evaluation that confirms and quantifies a disorder. A screening tool is fast and population-scale; a diagnostic tool is slow and individual; and a screen can never do the diagnostic tool's job. [1]
The reason a fellowship candidate must hold all three at once is that they fail in predictable ways when confused. Treating a screen as a diagnosis over-labels a well child whose false-positive score sits in a low-prevalence population; treating surveillance as a screen misses the child whose clinician's "gut feeling" reassured everyone but never put a number on the concern; and skipping the diagnostic step leaves a family with a worry and no answer. The schedule, the tools and the psychometric model exist to keep these three acts in their lanes. [10]
References11ShowHide
- [1]Council on Children With Disabilities, Section on Developmental Behavioral Pediatrics, Bright Futures Steering Committee, et al Identifying infants and young children with developmental disorders in the medical home: an algorithm for developmental surveillance and screening Pediatrics, 2006.PMID 16818591
- [2]Frankenburg WK, Dodds J, Archer P, Shapiro H, Bresnick B The Denver II: a major revision and restandardization of the Denver Developmental Screening Test Pediatrics, 1992.PMID 1370185
- [3]Squires J, Bricker D, Potter L Revision of a parent-completed development screening tool: Ages and Stages Questionnaires Journal of Pediatric Psychology, 1997.PMID 9212550
- [4]Glascoe FP Parents' evaluation of developmental status: how well do parents' concerns identify children with behavioral and emotional problems? Clinical Pediatrics, 2003.PMID 12659386
- [5]Robins DL, Casagrande K, Barton M, Chen CM, Dumont-Mathieu T, Fein D Validation of the modified checklist for Autism in toddlers, revised with follow-up (M-CHAT-R/F) Pediatrics, 2014.PMID 24366990
- [6]Baird G, Charman T, Baron-Cohen S, Cox A, Swettenham J A screening instrument for autism at 18 months of age: a 6-year follow-up study Journal of the American Academy of Child and Adolescent Psychiatry, 2000.PMID 10846303
- [7]Goodman R Psychometric properties of the strengths and difficulties questionnaire Journal of the American Academy of Child and Adolescent Psychiatry, 2001.PMID 11699809
- [8]Wolraich ML, Lambert W, Doffing MA, Bickman L Psychometric properties of the Vanderbilt ADHD diagnostic parent rating scale in a referred population Journal of Pediatric Psychology, 2003.PMID 14602846
- [9]Balasubramanian H, Ahmed J, Ananthan A, Srinivasan L Comparison of parent or caregiver-completed development screening tools with Bayley Scales of Infant Development: a systematic review and meta-analysis Archives of Disease in Childhood, 2024.PMID 38811056
- [10]Rah SS, Jung M, Lee K, Kang H Systematic Review and Meta-analysis: Real-World Accuracy of Children's Developmental Screening Tests Journal of the American Academy of Child and Adolescent Psychiatry, 2023.PMID 36592715
- [11]Arefadib N, Stewart B, Crespo-Gonzalez C, Coghill D Umbrella Review and Meta-Analysis: Screening Tools for the Identification of Developmental Delay in Early Childhood Journal of the American Academy of Child and Adolescent Psychiatry, 2026.PMID 40975434