Can you please assist with the given question:
As the Systems Analyst assigned to the Warehousing Application, you were responsible for preparing the requirements definition, high-level design and detail design documents. In addition, you worked closely with the programming staff to ensure that the program code complied with the design documents. The Quality Assurance section has completed exercising the test scripts and assured you that the programs appear to be performing in accordance with the detail design. This Warehousing Application replaces an old legacy system. It's now time for implementation. Develop a case for either testing the new system extensively, implementing without paralleling with the old system or processing both systems in parallel until any "bugs" have been identified and fixed before the old system is turned off. State the reasons for your choice.