Intolerance of Uncertainty Scale (IUS-12; Carleton, Norton & Asmundson, 2007)
The IUS-12 is a short form of the original 27-item IU Scale (IUS; Freeston, Rhéaume, Letarte, Dugas & Ladouceur, 1994), consisting of 12 items relating to the emotional, cognitive and behavioural responses to uncertainty, such as “unforeseen events upset me greatly” and“I can’t stand being taken by surprise”. Participants are asked to indicate how much they agree with each response on a 1-5 Likert scale, with scores of 1 corresponding to “not at all characteristic of me” , through to 5 indicating a response of“very characteristic of me” . Therefore, scores range from 12-60, with higher scores indicating higher IU. Carleton et al., (2007) suggest that this shortened version maintains internal consistency, with high correlations with the original IUS.