-	Require specialized skills to use the equipment 
-	Most expensive methodology 

Claremont Graduate University

- It is used to track users’ eye movements and understand where they look at in the interface, which helps designers and researchers to understand which content to emphasize or deemphasize 

Eye-tracking Testing

World Leaders in Research-Based User Experience. (n.d.). Quantitative user-research methodologies: An overview. Nielsen Norman Group. Retrieved March 5, 2022, from https://www.nngroup.com/articles/quantitative-user-research-methods/ 

Quantitative user-research methodologies: An overview

-	Having many participants look at the same interface will emerge a trend
-	Number of participants needed: 30 or more 

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