The temporal stability, or test-retest reliability, of Alva's personality test was estimated in a study where a sample of US participants completed the test twice. All factors and the majority of facets in Alva's personality test have 'Excellent' temporal stability according to European standards (EFPA). The remaining facets have 'Good' temporal stability.
The reliability of Alva's personality test was also estimated using the test information approach from modern test theory. All factors have 'Excellent' reliability and all facets have 'Good' reliability or higher.
Read more about reliability and information for Alva's personality test in the technical manual.