Worksheets change analysis

In addition to general comments, what else belongs in column 4 (Comments) on the change analysis worksheet ... 

Worksheets are normally not required. If the complexity of the change dictates the use of worksheets, use the system/subsystem hazard analysis worksheet format depicted earlier in Figure 8-4. 

Change analysis involves six steps. These steps are presented in the worksheet in Table 10.1. The following questions will help you complete the six steps and identify information required on the worksheet ... 

Graphics interface worksheet is a user-friendly way for human-machine communication. It usually consists of three parts (1) Problem specifications The specifications and the required data for the problem to be solved are entered by the user or estimated from the databases. Data are inserted via dialog boxes or buttons for changing some important magnitudes. (2) Problem-type selection The type of problem to be solved is selected via buttons. (3) Results presentation The results are obtained automatically, and are presented in the form of tables or charts. Since these charts are updated automatically, the user has at his disposal all the information needed for sizing, rating, sensitivity analysis, or comparison of alternative solutions. 

Keep the worksheets in the database updated. If you can do that, then the next time you do a safety analysis, use the database as a baseline document and just change what needs to be modified. Be careful not to assume that two systems are exactly alike. We all know that they are not. 

In the worksheet Example 12-5, invoke GOALSEEK nsing Data I What-If Analysis Goal Seek. In the GOALSEEK dialog box, enter the data as shown in Eignre 12-3 and click the OK button. In this case, cell D3 is changed until the value of the formula in cell A6 equals 250. 

---