Pre-employment testing involves using objective standardized tests to assess candidates' capabilities and traits. There are three main types of tests: aptitude tests measure critical thinking and problem solving skills; personality tests evaluate traits like conscientiousness and extraversion; and skills tests assess abilities relevant to the job like typing or math. Using multiple types of tests per candidate allows for a more reliable and informed hiring decision. Criteria Corp's HireSelect system provides web-based pre-employment testing to help companies streamline their hiring processes.