Home Situations Questionnaire-Pervasive Developmental Disorders version (HSQ-PDD) The HSQ-PDD [59] items are scored in two subscales: Socially Inflexible, and Demand-Specific. The properties of the HSQ-PDD were assessed in a sample of 124 children a ged 4 to 13 years . Structural validity for a two-factor solution was a reasonable fit (RMSEA 0.06) and internal consistency good (alpha 0.90 for the ‘socially inflexible’ subscale and 0.80 for ‘demand-specific’). Known groups validity and responsiveness (change over time) were also shown as good for the HSQ-PDD by Chowdhury et al [59]. In a further paper, responsiveness was shown related as hypothesised to change in the Vineland Daily Living Skills scale [63].

  The Home Situations Questionnaire—Pervasive Developmental Disorders version  (HSQ-PDD) more recently referred to as the HSQ-ASD [60], is a 25 item caregiver questionnaire designed to assess behavioural non-compliance in everyday situations by children. It was modified from the original Home Situations Questionnaire [ 61 ] by Chowdhury et al. [ 59 ] for use in assessment of children with ASD aged 3 to 14 year s, and originates from the Research Units in Pediatric Psychopharmacology Autism Network. The HSQ-PDD was used in one intervention evaluation study [20] in the review.