A third study confirms the potential usefulness of personality tests while underscoring the importance of job analysis. The researchers analyzed personnel testing studies and concluded that the predictive power of a personality test can be quite high. However they also found that the full potential of personality testing will be realized only when careful job analysis become the standard practice for determining which traits are relevant to predicting performanance on a given job. In summary personality tests can help employers predict which candidates will succeed on the job and which will not. However the job analysis and validation study must be carefully executed