When a question is selected in the LMS, the question is directly presented to the user. However, the completion status of the question remains "not attempted" at this point. If the user navigates away from the question before answering it, no attempt at the question has been made.
Note: The SCORM 1.2 specification does not allow "not attempted" to be sent to the LMS, only for it to be received from the LMS. It also specifies that if no completion status is sent to the LMS, then "not attempted" is automatically changed to "incomplete". Therefore, if the user navigates away from a question prior to answering it, on a SCORM 1.2 LMS the completion status is set to "incomplete".
When the user answers the question and clicks OK (or Do Not Know), the answer is judged (Do Not Know is automatically wrong). Since questions are graded, a completed question is never actually set to "completed", but rather to "passed" or "failed". Note that SCORM 2004 separates completion status from success status, and so under SCORM 2004 the question's completion status is set to "completed", with its success status set to "passed" or "failed".