Build-in Self-Assessment to Develop Critical Thinking: A Case for Annotation. If we want students to be critical thinkers, we must routinely and explicitly give them structured practice opportunities to critically examine their own thinking. Squeezing two or three metacognitive activities into a hectic semester teaches students that such reflection is only for special occasions. Rather, student self-evaluation should be a daily course routine. As an alternative to time-consuming, discrete, self-reflective assignments, we’ve turned to annotation as a built-in flexible routine to bolster any stage of the learning process. Annotation can help define grading criteria and reinforce course ideas.