CPP is an assessment company that makes up and administers several different personality tests, notably the MBTI and the CPI personality tests. The company also produces the Strong, TKI, and FIRO tests. It is best known for the MBTI-the Myers-Briggs Type Indicator.
The MBTI is a personality assessment which is useful in various aspects of life, including employment. It is currently not primarily used as a pre-employment personality test.
The CPI, or the California Personality Test, is an assessment specifically geared towards predicting employment performance. Two versions are currently available; the CPI-260, which has 260 questions, and the CPI-434, which has 434 questions. It is similar to the MMPI (the CPI-434 and the MMPI share 194 items) and takes 45-60 minutes to complete.