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Freely-available measures:

Adult Asperger Assessment (AAA)
Adult Scale of Hostility and Aggression: Reactive/Proactive (A-SHARP)
Adult Repitive Behavior Questionnaire-2 (RBQ-2A)
Arc’s Self Determination Scale
Assistance to Participate Scale (APS)
Autism Classification System of Functioning: Social Communication (ACSF:SC)
Autism Parenting Stress Index (APSI)
Autism Mental Status Exam (AMSE)
Autism Treatment Evaluation Checklist (ATEC)
Autism Quotient (AQ) - multiple versions
Baby Pediatric Symptom Checklist (BPSC)
Cambridge Mindreading (CAM) Face-Voice Battery (Adult)
Cambridge Mindreading Face-Voice Battery for Children (CAM-C)
Checklist for Autism in Toddlers (CHAT)
Child’s Challenging Behavior Scale (CCBS)
Childhood Autism Spectrum (formerly “Asperger Syndrome”) Test (CAST)
Children’s Empathy Quotient (EQ-C)
Children’s Scale of Hostility and Aggression: Reactive/Proactive (C-SHARP)
Communication Function Classification System (CFCS)
Communication and Symbolic Behavior Scales Developmental Profile (CSBS-DP)
DENVER II
Developmental Milestones Question Set of the Survey of Wellbeing of Young Children (SWYC Milestones)
Early Screening for Autistic Traits (ESAT)
Empathy Quotient for Adults (EQ)
Empathy Quotient for Adolescents (EQ-Adolescent)
Functional Communication Classification System (FCCS)
Gross Motor Function Classification System (GMFCS)
Manual Ability Classification System (MACS)
Modified Checklist for Autism in Toddlers-Revised with Follow-up (M-CHAT-R/F)
Motor Imitation Scale (MIS)
Nisonger Child Behavior Health Rating Form (NCBRF)
Parent Interview for Autism–Clinical Version (PIA–CV)
Parent’s Observations of Social Interaction (POSI)
Pediatric Symptom Checklist (PSC)
Preschool Pediatric Symptom Checklist (PPSC)
Quantitative Checklist for Autism in Toddlers (Q-CHAT)
Repetitive Behavior Questionnaire (RBQ-2)
Ritvo Autism Asperger Rating Scale-Revised (RAADS-R)
Sense and Self-Regulation Checklist (SSC)
Systemizing Quotient (SQ)
Systemizing Quotient for Adolescents (SQ-Adolescent Version)
Systemizing Quotient for Children (SQ-C)
Subthreshold Autism Trait Questionnaire (SATQ)
Survey of Wellbeing in Young Children (SWYC)
Ten Questions (TQ)
Viking Speech Scale
Waisman Activities of Daily Living (W-ADL) Scale

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We also track measures that failed to meet our inclusion criteria.