In this last phase of systems development, the analyst helps implement the information system. Thisphase involves training users to handle the system. Vendors do some training, but oversight of training is the responsibility of the systems analyst. In addition, the analyst needs to plan for a smooth conversion from the old system to the new one. This process includes converting files from old formats tonew ones, or building a database, installing equipment, and bringing the new system into production. Evaluation is included as part of this final phase of the SDLC mostly for the sake of discussion. Actually, evaluation takes place during every phase. A key criterion that must be satisfied iswhether the intended users are indeed using the system.It should be noted that systems work is often cyclical. When an analyst finishes one phase ofsystems development and proceeds to the next, the discovery of a problem may force the analystto return to the previous phase and modify the work done there.