The study refers to the social aspect of Autism Spectrum Disorder (ASD) and focuses on pro-social behaviour that has a positive effect on social adaptability. The first goal of the study was to determine whether there is a gap in prosocial-behaviour between children with High-Functioning ASD (HFASD) and children with typical-development; and secondly, to foster prosocial-behaviour with a computer-mediated intervention versus a non-computer-mediated intervention. The study comprises 58 preschool children, divided into three groups: HFASD experiencing a computer-mediated intervention, HFASD experiencing a non-computer-mediated intervention, and typically-developing children with no intervention. The 2-month intervention was based on the Cognitive Behavioural Therapy model, and pairs of children learned how to solve social-problems. Following preliminary screening tests (PPVT; SCQ), observations designed to evaluate prosocial-ability and Vineland questionnaires measuring prosocial-behaviour were conducted pre- and post-intervention. Pre-intervention findings indicated that children with typical-development exhibited higher prosocial-behaviour than children with HFASD. This changed however, post-intervention, as the gap between the two groups decreased. Additionally, the study found that the computer-mediated intervention group improved in some prosocial measures compared to the non-computer-mediated intervention.