Based on the Department’s analysis of a representative sample of tiering results, some facilities will see a change in their tiers. Some facilities that were previously not covered under CFATS will find themselves covered, and some currently-covered facilities may no longer be considered high-risk. Some of these tier changes are a result of changes to the tiering methodology, while others are the result of changes facilities have made to their businesses, such as adding new chemicals, removing chemicals of interest, or modifying storage methods.
Explaining the sample methodology also justifies the experimental design. Because research is orderly and direct, the samples methods section needs to tell what materials were used in the study, describe the research protocol, explain any statistical data and justify why the researcher chose a particular method of research. The methodology needs to state what problems were anticipated, if those problems arose and how those problems were mitigated, if they were. The methodology must give a full account of how data was collected or generated along with how it was analyzed.
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