Which reliability measure involves multiple assessors rating the same subjects?

The measure in question is inter-rater reliability. This type of reliability assesses the degree to which different assessors or raters yield similar scores when evaluating the same subjects. The emphasis on multiple assessors is crucial, as inter-rater reliability specifically examines the consistency of ratings across different individuals. High inter-rater reliability indicates that the evaluators agree closely on their assessments, suggesting that the measurement tool used is clear and reliable in capturing the intended constructs.

In contrast, test-retest reliability refers to the stability of scores over time when the same test is administered to the same subjects at two different points. Internal consistency measures the extent to which items within a single test measure the same construct, often evaluated using statistical techniques like Cronbach's alpha. Parallel form reliability examines the consistency of scores between different forms of the same test. Each of these other options focuses on different aspects of measurement, distinguishing them clearly from the concept of inter-rater reliability.