The data was gathered from computer programming courses at the University of Trento in Italy and the students were required to participate in the peer-based online homework activities. The students had to write the questions and the rated their peers answer on the scale 0-5 and the students could also assess their own answers. Final exam score was the number between 18 and 30 . As the authors found, the student votes alone for the homework assignments weren't good predictiors and they decided to use additional features: amount of tasks and the difficulty level of the question. The authors used linear regression model to predict final exam score.