“…Distinctions can nevertheless be made with regard to the intensity of their role and the skills that were required before the intervention could be applied (e.g., staff training). One distinct category consists of the nine studies that involved training staff members before they carried out the intervention (Bai et al, 2014 ; Bucholz et al, 2008 ; Cooper & Browder, 2001 ; Darling & Circo, 2015 ; Fox et al, 2009 ; Hoffman et al, 2019 ; Kruithof et al, 2018 ; Lifshitz & Klein, 2013; Martens et al, 2017 ; Samuel et al, 2008 ; Schaap et al, 2019 ; Taber‐Doughty et al, 2010 ; Vlaskamp & Van der Putten, 2009 ; Wagemaker et al, 2017 ; Watchman et al, 2020 ). For example, in a personalised day programme for adults with intellectual disabilities and autism (Fox et al, 2009 ), support staff were involved in both the selection of participants and the implementation of the programme.…”