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ITS HCI events:

• User event is a mouse-click within the ITS interface, see screenshot above.
• Events are recorded for each user in stats_[user_id] table under "event" column
• Each event is associated within the context of a question, referenced by its "question_id" column

EVENT	ACTION
chapter	upon Assignment mode "Submit" button click
skip-question	upon "skip" button click
equation	upon "Equation" pull-down button click
table	upon "Table" pull-down button click
image	upon "Image" pull-down button click
example	upon "Example" pull-down button click
book	upon book icon (upper left menu) pull-down button click

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Pre-Test / Post-Test

1. Pre-test: questions in chapter_id = 1-7
2. Post-test: questions in chapter_id = 8