OBJECTIVE. This article describes the development of a brief, ecologically valid, self-report questionnaire, the Adolescents and Adults Coordination Questionnaire (AAC–Q), used to identify developmental coordination disorder (DCD) in adolescents and adults.

METHOD. The AAC–Q was completed by 28 adolescents and adults with suspected DCD ages 16–35 yr (mean [M] age = 21.18 yr) and 28 peers without DCD (M age = 27.64 yr). Cutoff scores for suspected DCD were established using data from a sample of 2,379 participants ages 19–25 yr (M age = 20.68 yr).

RESULTS. Reliability of the AAC–Q was determined using Cronbach’s α (α = .88) and test–retest reliability (r = .94, p < .001). Independent-sample t tests to assess construct validity revealed significant differences between participants with and without DCD, t(27) = 9.37, p < .001.

CONCLUSION. The AAC–Q is a standardized, reliable, and valid tool with potential for both research and clinical use.

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