Completion Threshold can be used to determine if the learner has completed the Sharable Content Object (SCO), according to pre-specified requirements. The Completion Threshold is basically a defined point that must be exceeded to be considered complete. The Completion Threshold can be compared with the Progress Measure to determine completion.
The Instructional Designer, during the design phase of the content, determines whether the SCO is considered completed. If completion is an activity, then completion of the SCO could be when the learner completes 75% (or any percentage) of the activity, which is determined to equal completion.