Increased competition and Turkey's entrance to the Customs Union with the European Union has boosted a quality movement throughout all sectors. In the service sector, banks have been the leaders for grasping the importance of quality issues. This study attempts to measure customers' satisfaction and personnel's understanding and implementation of service quality in a commercial bank. The study innovates with respect to former studies undertaken at Bilkent, as for the first time in the University, the Service Quality assessment is undertaken at two distinct locations and the results compared. The specific tool used in this study is the SERVQUAL instrument, a valuable tool for assessing both customers' degree of satisfaction with the service, and for finding out the eventual service quality gaps occurring at the service providers' side of the transaction.