The brief Dimensional Apathy Scale (b-DAS) has been validated for use and recently published in Journal Archives of Clinical Neuropsychology. The paper can be found here. It shows excellent convergent and divergent validity against comparable measures and the original informant/carer-rated DAS. Further, it highlights the association apathy subtypes awareness and cognitive functioning.
The b-DAS is available on the website and can be downloaded, along with ‘Frequent Asked Questions’, on the b-DAS page.