Supply chain management systems (SCM) play a dominant role in recent retail business. These systems are providing high performance-low cost products to customers in multiple locations. The business communications have been maintained through mobile applications. Users get services and delivers feedbacks through the mobile applications of SCM systems. Further, most important features are developed for mobile applications in SCM systems. So the usability evaluation of mobile application is very important for these systems. Even the evaluation of usability should be measured by considering user goal and their applications area. In this paper, we critically examined usability using a mobile application interfacing on most popular retail business application, SCM system, by adapting an improved usability model. The purpose of this research was to investigate the usability factors influenced on SCM system users. Usability factors, human engineering, satisfaction, usability compliance, learnability and reliability get more priority. Survey questionnaire was used as a data collection method and statistics analysis was done to obtain the result of impact. Several potential outputs were achieved and further explained.