The main focus was on cognitive ability tests and specific skills sets. An interesting question, therefore, is where does personality fit in?
Personality tests are psychometric tests. They are based on personality research and theories about how personality is structured and how it can be assessed. They have robust psychometric properties (high validity and reliability) and normative data gathered from many thousands of people. They look at a different type of individual difference: individual propensities to think and act in certain ways. Unlike cognitive ability tests and skills tests there is no right or wrong answer. Different jobs and positions in jobs have different personality types that are best suited to them. Although, there are certain personality traits where performance in a certain range is preferable for many jobs.