The simulator sickness questionnaire (SSQ)  is an extensively researched protocol for measuring reported simulator sickness. It breaks simulator sickness into three components: nausea (nausea, stomach awareness, increased salivation, burping); oculomotor (eyestrain, difficulty focusing, blurred vision, headache) and disorientation (dizziness, vertigo). The components can be combined to give a total SSQ score. The SSQ was used as a measure in the simulator sickness experiments of Chapter 6.
See Appendix G for the full specification of the SSQ.