The clinical research associate (CRA), also known as the monitor, acts as the main line of communication between the sponsor and investigator. The CRA is responsible for evaluating investigators to ensure they are qualified through training and experience and have adequate resources to properly conduct the trial. Additional responsibilities include conducting pre-study visits to assess investigator experience and facilities, site initiation visits to detail study obligations, and routine monitoring visits to ensure subjects' rights and data accuracy and compliance with regulations. The CRA also performs site closeout visits when enrollment and subjects' activities are complete and data are finalized.