Which type of reliability assesses whether an assessment yields consistent results across its individual items?

Internal consistency reliability assesses whether an assessment yields consistent results across its individual items. This type of reliability examines the degree to which different items that measure the same construct produce similar scores. For instance, in a questionnaire designed to evaluate a specific skill or trait, internal consistency reliability ensures that all items aimed at measuring that skill or trait correlate well with one another. High internal consistency indicates that the items are measuring the same underlying concept, providing confidence in the assessment's accuracy and reliability.

In contrast, test-retest reliability evaluates the stability of an assessment over time, while inter-rater reliability focuses on the consistency of scores assigned by different assessors. Construct reliability pertains to how well a test measures the theoretical construct it is intended to measure. Each of these reliability types serves a distinct purpose, but when considering consistency among individual assessment items, internal consistency is the key focus.