Abstract: Human-Computer Interaction (HCI) is a branch of Computer Science that is leveraged to explore and improve the interaction of humans with different types of Computer Interfaces like Applications on Personal Computer, WEB, Mobile Devices, Infotainment systems in cars, etc. In order to improve the user experience with these interfaces, designers perform different evaluations on the interface to figure out if there are any improvements that can be made to the Interface. This paper focuses on a specific area of Evaluation technique which is known as the Heuristic Evaluation Technique. The technique is used to measure the usability of the Computer Interface. Leveraging the Heuristic Evaluation Technique we are going to evaluate an existing interface of a website known as the craigslist.com.