Concept maps are a visualization of links between important concepts of topics, units or even courses. They allow to judge the growth in the relative sophistication of your students' mental model or explanation, if developed and assessed over time. Let your students create concept map or let them upvote/ down vote the different links between the terms.
MINI: You can use these tips quickly and with little effort in your current teaching.
Create a list of key terms that you definitely want to see mentioned as a grading rubric.
Remind the students to take notes on the key concepts from the class. You can do so with a Merksatz block in Courseware before or after a micro lecture. Depending on the level of the course, you could provide a handful of terms and ask them to add to the list of terms.