Item-validity analysis of the SED-S in a multicentre study of adults with intellectual disabilities.

Background: Valid and reliable instruments for measuring emotional development are critical for a proper diagnostic assignment in individuals with intellectual disabilities. This exploratory study examined the psychometric properties of the items on the Scale of Emotional Development-Short (SED-S).

Method: The sample included 612 adults with intellectual disabilities (M = 37.

Standardizing the assessment of emotional development in adults with intellectual and developmental disability.

Objective: The Scale of Emotional Development-Short (SED-S) is an instrument to assess the level of emotional development (ED) in people with intellectual and developmental disability. Index cases are developed as a didactic tool to standardize the application of the scale.

Method: In a stepwise process, a European working group from six countries developed five index cases, one for each level of ED.