In the remainder of this report, the subcommittee reviews the Navy 's documentation and provides an assessment of the Navy's approach for setting occupational exposure limits. Chapter 2, Chapter 3, Chapter 4, Chapter 5 through Chapter 6 provide commentary on the adequacy and completeness of the Navy's review of the relevant scientific literature and its interpretation. Specifically, Chapter 2 discusses information on manufacturing processes, chemical composition, and classification of fibers; Chapter 3 assesses data on sampling, analytical methods, and dosimetry; Chapter 4 reviews biopersistence of vitreous fibers; Chapter 5 discusses toxicological studies on MVF; and Chapter 6 addresses the epidemiological studies. Chapter 7 reviews the Navy's approach to selecting an exposure limit and offers recommendations on how the Navy could conduct the kind of scientific evaluation and risk analysis necessary to establish a protective exposure limit. Chapter 8 addresses information gaps and topics for future research.