Delirium will be assessed prospectively once per day on postoperative days 1, 2, and 3 by a trained study team member using the Confusion Assessment Method [CAM]. For patients that are in the Intensive Care Unit (ICU) postoperatively, the Confusion Assessment Method for the ICU (CAM-ICU) will be administered prospectively twice per day on postoperative days 1, 2, and 3 by a trained study team member (Attachment-CAM-ICU). Delirium is most common on postoperative days 1-3 and the CAM is a well-validated measure of delirium in surgical patients. For functional status, the WHODAS will be administered 6-12 months postoperatively either by personnel in the surgeon's office as part of routine follow up or by study staff or by telephone. We will also collect information on secondary outcomes including presence of an advanced directive, whether they had surgical procedure, time to postoperative anesthesia care unit (PACU) discharge, discharge to place other than home (rehabilitation, skilled nursing facility), hospital length of stay (LOS), in hospital complications, anesthetic dosages (including bispectral index (BIS) information), estimated blood loss, blood pressure, oxygen saturation, 30-day reoperation or readmission rate, and 30-day and 1-year mortality. These outcomes are recorded in the medical record, the BWH Balanced Scorecard, an electronic database of all hospitalized patients that tabulates 31 elements of the hospital event, or the Brigham and Women's Hospital BWH Research Patient Database Enhanced Query. Data will also be confirmed by a follow up telephone interview.