What is the best method to use when checking references?

Although third party reference checking is a good means by which to secure objective and accurate references, the immediate supervisor should make every effort to check with the construction executive job seeker's previous construction employer's) and personally ask the questions that determine if he construction executive job seeker has the required competencies.
When doing reference checks it is always better to meet in person with a reference. A supervisor will learn more over lunch about the construction executive job seeker and the credibility of the construction executive job seeker's reference, than over the telephone.