There are four system changeover methods for BHSSRS.
Direct Cutover
The direct cutover approach causes the changeover from the existing BHSSRS to the new BHSSRS to occur immediately when the new system becomes operational. The advantage of direct cutover changeover is the least expensive changeover method. The disadvantage is more risk than other changeover methods, such as data errors and system failure.
Parallel Operation
The parallel operation method requires that both the exiting BHSSRS and the new BHSSRS operate fully for a specified period. Data is input into both systems, and output created by the new BHSSRS is compared with the equal output of the old BHSSRS. The old system is terminated when students, management and IT group satisfy the new system operation. The most obvious benefit of parallel operation is lower risk. There are two drawbacks of parallel operation. Firstly, it is the most expensive changeover method. Moreover, it causes processing delays.
Pilot Operation
The parallel operation method implements the complete new system at a part of Bowen High School, such as registration department and library. During pilot operation, the old system continues to implement for the whole school, including the pilot site. After the new system operates successful at the pilot site, it is implemented in the rest of the school. There are three advantages of pilot operation changeover. The first one reduces the risk of system failure, compared with a direct cutover method. The second one is less expensive than a parallel operation. The last one is that the changeover period can be much shorter if the system proves successful at the pilot site.
Phased Operation
The phased operation approach provides a part of the new system such as book loan system to all students in stages, and each subsystem can implement any of the other three changeover methods. There are two benefits of a phased operation. The first benefit is that the risk of errors or failures is limited to the implemented module only. In addition, it is cheaper than full parallel operation. The drawback is that it can cost more than a pilot approach if the system involves a large number of separate phases.
Reference List
Shelly, G, Chasman, T, & Rosenblatt, H 2006, System analysis and design, 6th edn, Thomson Course Technology, Boston
