Usability has become a very critical factor for the success of a website. The study focuses on constructing a scoring model of websites that is based on observed usability test data. In the proposed model, the first usability test is designed including 4 important tasks. These tasks include finding information in the website about MMS regulations, calling fees, searching for IMEI numbers, and listing shop addresses. The usability test is followed by multi-attribute decision making model for the purpose of obtaining a usability score of the websites.