“…Individuals with severe/profound intellectual and/or multiple disability tend to function at pre-intentional communication stage and may experience sensory and physical disabilities and health issues (Coupe O'Kane and Goldbart, 1998; Erickson and Quick, 2017; Sigafoos et al, 2021; van Splunder et al, 2006). Expressive communication tends to involve a range of subtle and idiosyncratic behaviours that may be individual to the person or context (Stillman and Siegel-Causey, 1989) such as eye gaze, body language and movements, changes in muscle tone, facial expressions, vocalisation (Brady et al, 2016; Coupe O’Kane and Goldbart, 1998; Parry Hughes et al, 2011; Petry and Maes, 2006).…”