A stand-alone evaluation module composed of sixty
ECHO cases was also developed for pre-test and posttest use. At logon, users were asked to record a self
assessment of experience and confidence in
echocardiography before they could proceed with
viewing cases. After examining each case, the user
typed the visually estimated cardiac ejection fraction
into the computer keyboard and the response was
logged to a separate file for later statistical analysis
and creation of a normative database.