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You might want to add a grade item for any assessment not directly related to a marked activity in Moodle, for example offline assignments, extra credit or tutor or tutor feedback, or to transfer marks from external assessment tools such as RogoExamSys,

One way of doing this is to add a 'Moodle Assignment' activity to your module page. Grades for this will automatically be included in the Gradebook. It can be useful, e.g., for returning grades and feedback for an offline assignment such as a presentation or lab work.  See creating a Moodle assignment.

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