Support for this feature is provisional. EdX is currently working with a limited number of partners to test this feature on edX Edge.
When you include the problem components in a graded edX subsection in an external LMS, the edX system grades the learner responses to those problems. The edX system then transfers the learner scores back to the external LMS. This exchange between an external LMS, the edX system, and the external LMS again is near real time. It can take a few moments to complete this exchange for a single problem component, and up to several minutes to return aggregated scores of all of the problems in a unit or subsection.
When you include edX problem components in an external LMS, note the following requirements.
For more information about constructing an LTI URL for a course component, see Determining Content Addresses.