This presentation focused on the principal questionnaire used to examine online learning known as the Community of Inquiry (CoI) questionnaire (Caskurlu, 2018; Diaz, Swan, Ice, & Kupczynski, 2010; Shea et al., 2014) using Rasch model analysis.  Ensuring high quality online education requires confirmation that the instrument used to examine online courses is composed of valid indicators of the construct being studied.  Examining the characteristics of students who enroll in online courses and how they engage with the CoI questionnaire, is critical to high quality online instruction.