This study examines the social validity of a family-centred collaborative approach to developing Social Stories™ to support the behavioural and communicative functioning of children with autism spectrum disorder (ASD). Twenty children with Pervasive Developmental Disorder (PDD)/Autism, PDD-Not Otherwise Specified, or Asperger's Disorder (aged 4-12 years) participated in a multiple baseline design across behaviours with a 6-week follow-up. The effects of behaviour stories (to reduce problem behaviours) and communication stories (to facilitate communication) as assessed by parental subjective perceptions of child functioning were evaluated and compared. Using daily parental ratings, behaviour stories were deemed effective for 11 of 17 stories (64.7%), whereas communication stories were deemed effective for 10 of 19 stories (52.6%), with great variability in effect size for both. Results also indicated variability in performance across specific story targets, although parents' perceived effects of Social Stories™ were not linked to any known child characteristics. This study argues that intervention using Social Stories™ to address behavioural and communicative functioning can yield socially valid outcomes across a range of child characteristics and intervention targets. Implications for clinical practice and how present methodological limitations can be addressed in future research are considered.