FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Parallel running is a strategy for system changeover where a new system slowly assumes the roles of the older system while both systems operate simultaneously. This conversion takes place as the technology of the old system is outdated so a new system is needed to be installed to replace the old one.

Detailed explanation-2: -In a parallel changeover, the new system runs simultaneously with the old for a given period of time.

Detailed explanation-3: -With a pilot changeover, the new system is tried out at a test site before launching it company-wide. For example, a bank may first test the system at one of its branches. This branch is referred to as the pilot, or beta, site for the program.

Detailed explanation-4: -The main system changeover methods are the parallel, direct, pilot, and phased changeovers. They are implemented differently depending on the organization’s situation. Each strategy has its advantages and disadvantages.

Detailed explanation-5: -Parallel installation is when both system; old and new system are operating at the same time until the management decide that the old system can be turned off as in Figure 12-3. This approach is known as riskless approach because all major problems have been solved before the old system is turned off.