In March 2013, David Foster Caveon of Caveon and Harry Layman of The College Board published an article comparing in quite some depth various online proctoring systems. On the last pages they present some overall findings in which they distinghuis what system would be needed for the height of the stakes of the exams. Very insightful.
Further, they report about the percentage of recorded proctoring misbehavior incidences that are typically encountered during proctoring sessions. In the OP4RE project this will be taken as a benchmark.
You can read the complete report here: