Literature Review: A systematic review of the literature relating to self-reported impulsivity, self-control and hoarding. Fourteen papers capturing 18 separate studies were eligible for inclusion. Three major categories of selfreport measures were employed: impulsivity, self-control and personality. Overall, findings were contradictory with studies providing support both for the presence and absence of a significant relationship between impulsivity/self-control and hoarding behaviours. Disparate measurement tools showed little convergence of findings. This inconsistency of findings reflects a pattern in the wider impulsivity and self-control literature. Clinical implications of the presence of impulsive features/traits in Hoarding Disorder are considered. Methodological limitations and recommendations for future research are outlined. Research Report: An adjudicated hermeneutic single case efficacy design (HSCED) explored the treatment of Hoarding Disorder (HD) with cognitive analytic therapy (CAT). Quantitative and qualitative outcomes created a rich case record subsequently debated by affirmative (N=3) and skeptic (N=3) research teams. This debate was viewed by expert independent judges (N=3) who returned a unanimous verdict that CAT was inefficacious, with lack of change on validated hoarding measures central to their judgement. Findings are considered in relation to methodological limitations, viability of the adjudicated HSCED methodology and the potential role of analytically informed treatment of HD.