Protection can be used at multiple levels to protect workbooks, worksheets, and individual cells. In the case of the bond amortization schedule, this protection ensures that users adjust only certain cells and cannot inadvertently alter elements that should remain static. However, a bond amortization schedule is not the only worksheet for which protection is appropriate. Depending on factors such as the frequency with which a worksheet is disseminated and the number of users with access to the file, various levels of protection can be beneficial for many of the accounting-related spreadsheets.