The contribution analyses the knowledge of aberrations affecting non-verbal communication in children with Autistic Spectrum Disorder (ASD) from the perspective of speech and language therapists (SLTs) working in schools as well as in medical settings in the Czech Republic via a questionnaire (n= 69 responding SLTs of 369 originally addressed). 50.72% of SLTs perceive the specifics regarding disruption of nonverbal communication. The most frequent deficits detected are those relating to pragmatics (44.93%), the lexical-semantic linguistic level (21.74%) and the morphological-syntactic linguistic level (20.29%). The research highlighted visible deficits associated mainly with the knowledge domain of SLTs within ASD. (C) 2014 The Authors. Published by Elsevier Ltd.