Different forms of assignment feedback. Assignment feedback plugins were introduced in Moodle 2.3.
This allows a teacher to annotate and return PDF files that have been submitted by students. Teachers can add and position comments and draw lines, ovals, stamps, rectangles and highlights onto the student's work, from within the browser.
An optional, but highly recommended addition to the Mahara Assignment Submission plugin. This feedback plugin allows Moodle to automatically lock and unlock editing of portfolio pages in Mahara once they've been submitted.