A study in a university clinic/laboratory investigated adaptive Bayesian scaling as a supplement to interpretation of scores on the Mini-IPIP. A "probability of belonging" in categories of low, medium, or high on each of the Big Five traits was calculated after each item response and continued until all items had been used or until a predetermined criteria for the posterior probability has been obtained. The study found higher levels of correspondence with the IPIP-50 score categories using the adaptive Bayesian scaling than with the Mini-IPIP alone. The number of additional items ranged from a mean of 2.9 to 12.5 contingent on the level of certainty desired.