The new Traffic Alert and Collision Avoidance System (TCAS) provides independent aircraft derived traffic and resolution advisories in the cockpit. Proper interpretation of this new information requires the crew to be familiar with new displays and the source of the information presented. This paper reviews the basic operation of TCAS to show how the advisories are developed. Then currently proposed displays are used to indicate how the information is presented. Integration of the TCAS data with ground ATC information and some limitations in the TCAS advisories are discussed.