We have established the COGAIN Technical Committee which aims to develop an internationally recognised standard for the measurement of eye tracker accuracy. The first committee meeting by email is underway. We are now working on an agreed set of definitions and terms, addressing questions such as what can be considered 'raw' data? How can we define accuracy?

You can see a list of current working definitions and comment in our forum here:
http://www.cogain.org/forums/eye-tracker-accuracy-and-precision-general-...