4.1 Self-reflection or self-knowledge is a combination of purposeful reflection and introspection reliant upon consciousness and is integral to metacognition.
4.2 Self-knowledge is the core of metacognition, specifically metacognitive knowledge, and involves knowledge of strategies and processes and develops in and is affected by complex problem solving situations.

See assertions on page 45 and 46 in the book The Taxonomy of Metacognition.