These checks help you confirm information on the candidate's application form and resumes. You will also gain greater insights into the candidate's skills, knowledge and abilities from someone who has actually observed the candidate perform.
It is important that during the interview process, you obtain consent from the candidate to contact their references and ask employment-related questions. A common mistake managers often make is asking candidates to choose their references. Instead, you should tell the candidates that you wish to speak to the people who actually supervised them. It is good practice to speak to two or three work-related references. If the current employer does not know they are seeking work elsewhere, then go to the previous employers.
Before making the calls, make a list of questions so that you are asking the same set of questions, giving you a consistent frame on which to base your decisions. All questions should be job-related and legal. You cannot ask questions during a reference check that you are prohibited from asking during an interview.