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CHAPTER 3 The Tool 3.1 Worksheet Integration and Data Flow When the accompanying Excel file is opened, tabs at the bottom of the screen indicate sepa- rate worksheets within the tool. Each worksheet takes up more than a standard-size view screen. The "Page Down" key can be used to view the lower rows. In the worksheets that are wider than the view screen, the right arrow key can be used to view the remaining columns. The worksheet labels shown on the tabs at the bottom of the workbook are listed below with a brief description of their contents. 1. Evaluation Weights--for entry of evaluation criteria weights. 2. Valuations--for sorting of GSMs based on utils. 3. Characteristics--for review and editing of GSM characteristics. 4. Applicability Ranks--for review and editing of GSM applicability ranks according to the evaluation criteria. 5. Costs--for development of GSM costs and assessment of GSM pre- and co-requisites. 6. Cost-Util & Strengths--for sorting of GSMs based on cost per util and for assessing GSM strengths and weaknesses. References--lists references referred to in Worksheets 3 and 5. Hidden Calculations--uses entries in Worksheets 1 and 4 to calculate values shown in Work- sheets 2 and 6. The user does not need to view this worksheet. Each worksheet is described in detail below. Figure 2 provides a diagram of the data flow between the worksheets. 3.2 Worksheet 1, Evaluation Weights The tool uses five sets of evaluation criteria to calculate the utils of various security measures for an operation: security objectives, non-security effects, 33 CFR compliance, locations, and threat type. The completed tables in Worksheet 1 of the tool will be used to weigh the impor- tance of the different evaluation criteria to the operation. The tables from Worksheet 1 are grouped by evaluation criteria and are provided below. 8