University training consists of several activities. One of the main activities is evaluation of its results. Integral part of the assessment is examining studentś knowledge. This process is demanding not only from the position of the student, but also of his/her teacher. Verification represents a specific system of diverse methods, forms and means, where the teacher is the decisive factor in their choice. Whether the choice is suitable or not, it is therefore reflected in the quality of the process and it also affects its outcome (which is the student's success or failure). To see the cause of failure or success is a factor that greatly influences the university student's motivation and choice of learning strategies. However, the same process provides the university teacher with feedback of the assessment process. Information that teachers receive may help them to improve their teaching activities. In conclusion we present preferences of causal attributes of studentś success or failure in the process of knowledge testing.