Some students, when using tutoring systems,trustedessays attempt to guess systematically to obtain the answer without knowing the material.
For instance, a student may enter 1,2,3,4,… or may click every checkbox within a set of multiple-choice answers, until the tutor identifies a correct answer and allows the student to advance.
Systematic guessing is considered to be a type of gaming the system.
Baker, R.S., Corbett, A.T., Koedinger, K.R., Wagner, A.Z. (2004) Off-Task Behavior in the Cognitive Tutor Classroom: When Students "Game The System". Proceedings of ACM CHI 2004: Computer-Human Interaction, 383-390. pdf