In a statistics course for engineers, we have designed a system for assessment where web based quizzes is one of the key elements. The basic ambition has been to find a way to make students more active during the course, and to provide learning situations where discussion and collaboration are key elements. The need to achieve this in a cost-effective way has also been addressed. The new course design is a structure where students along the course have to answer sets of randomly selected questions that often are based on random data sets. The course design has made it possible to encourage student collaboration, both in other parts in the course and in quiz answering.