The aim of this thesis is to examine how teachers use computer based assessment in their work and what user barriers they experience while working with computer based assessments. The result of the thesis is meant to provide an understanding of which factors affect the use of computer based assessments and how a company who provide computer based assessments applications can increase the rate of use amongst teachers.To investigate this, the author examined a company in Sweden who provide a computer based assessment application for both universities and high schools. The study was carried out at two different schools, a university and a high school, both located in Stockholm. In total nine teachers were interviewed. The author also conducted observations at the company whose computer based assessment application was examined.The author’s findings suggest that a lack of functions within the application and lack of costumer support from the company all negatively impacted the teacher’s use of the application. There were also findings that could suggest that a lack incentive to use the application may have negatively impacted teacher’s rate of use.To increase the rate of use, the author suggest that companies must work closer with teachers to understand their routines and develop applications accordingly. Companies should also be using teachers who already are using computer based assessment to develop incentives so that other teachers may start to use computer based assessments applications more frequently