Rationale

See track changes for suggested changes, which include: 1. Removed use of most acronyms to improve readability and comprehension. 2. Revised 4.3 for clarity. 3. Removed 5.1.11.4 because it was out of place. Proficiency tests are not an example of a test method characterization study. 4. Removed mention of “various materials” in 5.3.1 because otherwise, it may indicate using different matrices. 5. Made two of the sentences in 5.3.2 sub-bullets of 5.3.2. 6. Made a sentence in 5.3.4 a sub-bullet of 5.3.4.