There are four main types of candidate testing: skills based, behavioral, cognitive, and integrity. Skills based tests assess a candidate's ability to apply knowledge and think critically, and are the most commonly used at 52%. Behavioral tests like the Predictive Index measure work personality and are used 38% of the time. Cognitive tests evaluate learning and problem-solving capabilities and make up 18% of assessments. Integrity tests aim to measure honesty and work ethic, the least common at 10%. Each type of test serves a different purpose in predicting job performance and success.