The initial Scale of TRIAD Social Skills Assessment (TSSA) was developed to enable the mainstream or special education teachers in providing information on the descriptions of social skills among students with Autism Spectrum Disorder (ASD) under the Inclusive Education Programme (IEP). There were four subscales namely; Initiating Interactions (II), Affective Understanding/Perspective Taking (AU/PT), Responding to Initiations (RI) and Maintaining Interactions (MI) of which were being identified by Wendy et al. (2010). The purpose of this study is to explore the cross-validating and reliability testing of the scale among Malaysian students with ASD who are involved in IEP. Measures of Rasch Measurement Model (RMM) Item Analysis and Exploratory Factor Analysis (EFA) that have been conducted, showed that TSSA (within Malaysian context) is a multi-dimensional scale with four factors structured. Cronbach's alpha reliability coefficient value was at 0.960. Therefore, results indicated that the 24-item-TSSA can serve as a valid and reliable instrument for social skills assessment among students with ASD in IEP classrooms within Malaysian context.
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