Your installation plan may include testing in production to insure that the installed systems are working as expected. Contingency plans list the possible problems that you can foresee and what steps you will take if these problems occur. If possible, you may want to install the ready system and run it in parallel with the old system and compare results. Your contingency plans should not include reverting to the old system. The Internet has thousands of web sites dedicated to the year 2000 problem.
Many sites have links to sources of freeware, planning tools, and discussion groups.
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