When using a psychological test in any setting, it is of great interest for both the administrator and the respondent that the test is actually measuring what it claims to measure.
We investigated the construct validity of Alva's personality test by asking a sample of US participants to complete our test and the IPIP-NEO-120. Both tests measure the Big Five factors of personality. The validity was 'Excellent' for all factors and most of the facets, according to European standards.
Read more about the findings in the technical manual.
 Note that Emotional Stability is the opposite of Neuroticism, which is the factor measured in the IPIP-NEO-120. Therefore, the correlations are expected to be negative.