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Decentering is defined as the ability to observe one's thoughts and feelings as temporary, objective events in the mind, as opposed to reflections of the self that are necessarily true. The Experiences Questionnaire (EQ) was designed to measure both decentering and rumination but has not been empirically validated. The current study investigated the factor structure of the EQ in both undergraduate and clinical populations. A single, unifactorial decentering construct emerged using 2 undergraduate samples. The convergent and discriminant validity of this decentering factor was demonstrated in negative relationships with measures of depression symptoms, depressive rumination, experiential avoidance, and emotion regulation. Finally, the factor structure of the EQ was replicated in a clinical sample of individuals in remission from depression, and the decentering factor evidenced a negative relationship to concurrent levels of depression symptoms. Findings from this series of studies offer initial support for the EQ as a measure of decentering.

The development of the Mindfulness‐Based Cognitive Therapy Adherence Scale (MBCT‐AS) is described. This 17‐item scale measures therapist adherence to the treatment protocol for Mindfulness‐Based Cognitive Therapy (MBCT), a treatment for the prevention of recurrence in Major Depressive Disorder. The MBCT‐AS assesses therapist behaviours specific to (MBCT) as well as therapy practices that MBCT shares with Cognitive Behaviour Therapy (CBT). To determine the utility of this scale, we compared delivery of group MBCT against group CBT, with independent ratings of taped sessions provided to measure adherence to MBCT and CBT for therapists in both groups. The results showed that: (a) raters can reliably use the MBCT‐AS; (b) MBCT therapists demonstrated adherence to the treatment protocol, as measured by the MBCT‐AS; and (c) MBCT is distinguishable from CBT on both the MBCT‐AS and a scale measuring adherence to CBT (CBT‐AS). These findings indicate that the MBCT‐AS may be a useful tool for ensuring the proper delivery of MBCT in future research, and may be helpful in determining the elements of MBCT that are unique to that treatment.