[en] The High-Level Waste (HLW) area has four roll-up systems that are scheduled to attain Year 2000 compliance by 10/31/99, seven months after the desired 3/31/99 data. These systems control the integrated operation and safe shutdown conditions of the Extended Sludge Processing, the Defense Waste Processing Facility, and associated storage and transfer tanks. When any of these systems are shut down for modifications, other measures must be taken to ensure these facilities, which contain highly radioactive material, are maintained in a safe configuration. Accordingly, Year 2000 hardware and software modifications must be treated in the same disciplined manner, as would modifications of any other type. Based upon previous experience of installing and starting up these systems before initial operation, completion of the Year 2000 Implementation by 3/31/99 is not physically possible. After careful analysis of the current constraints, the last implementations cannot be completed earlier than 10/31/99. The proposed schedule achieves Year 2000 compliance by 8/31/99 for TANKMSS systems and 10/31/99 for DWPFMSS, DWPFPCS, and TANKPCS systems. It also meets best engineering and operations practices, minimizes costs and the risk of systems failure, and allows for two full months of normal system operation prior to 1/1/2000. SRS will continue to make every effort to improve the schedules of these systems, and look for windows of opportunity to maximize the Task Ready approach during planned and unplanned outages. This involves having work packages ready well in advance of the planned work schedule to seize any opportunity to complete work ahead of schedule