This article “provides an overview of the conceptual and methodological issues involved in developing and evaluating measures of metacognition and self-regulated learning.” Sections in this article discuss the components of metacognition and self-regulated learning as well as the assessment of metacognition.
Pintrich, Paul R.; Wolters, Christopher A.; and Baxter, Gail P., “2. Assessing Metacognition and Self-Regulated Learning” (2000). Issues in the Measurement of Metacognition. Paper 3.