“…Potential explanations for this uncertainty include: fundamental differences in diagnostic constructs for people with ID (Bertelli, Rossi, Scuticchio, & Bianco, 2015;; inconsistent definitions of challenging behavior (Hemmings et al, 2013); overlap between the two problems (Holden & Gitlesen, 2009), and practical difficulties in utilising a categorical diagnostic system in both clinical practice and research (Thakker, Bamidele, Ali, & Hassiotis, 2012). Against this challenging backdrop, the research can, at best, be interpreted in different ways (Bernstein, Visconti, Csorba, Radvanyi, & Rojahn, 2015) and, at worst, as contradictory (Hemmings, Deb , Chaplin, Hardy, & Mukherjee, 2013;McCarthy et al, 2010).…”