We are all familiar with how important is for students to develop a sense of metacognition and being aware of their learning process.
TThis chart is very helpful to gather information about the student knowledge about a certain topic, specially at the beginning of studying a new unit.
How to use:
-Print a copy for each student.
-At the beginning of the unit only complete the K and W column: what they know about the new topic and what they wonder.
-After they studied the topic, they can complete the L column of what they'd learned.

This routine has a lot of variations, but this template is from Pinterest.