How is Course Progress Calculated by the SCORM Engine

Another good question from one of our SCORM Engine clients.  How does the our LMS source the value shown as "Course Progress" against a course? Is it based on
(a) cmi.core.lesson_status
(b) cmi.objectives…
(c) cmi.interactions…
(d) something else (please explain) or
(e) a combination of the above? (please explain)

Answer:  The Course Progress that optionally shows up on your main deliver page (beside the show/hide, exit course links, etc), calculates this value by simply determining how many scos are completed and not failed. So single sco courses will show 0 then 100%, not very helpful. There's not really a great/reliable way of reporting progress,some clients may opt to just not use it.