Information System Life Cycle
by Jonathan Walker
1. Maintenance Phase
1.1. Involves day-to-day operation of the system, making modifications to improve performance, and correcting problems. After an information system is implemented, it remains in operation for a period of time. During this time, maintenance activities ensure that the system functions as well as possible. There are a list of activities for this phase: 1. Operate equipment. 2. Make backups. 3. Provide help to users. 4. Fix bugs. 5. Optimize for speed and security. 6. Revise software as necessary to meet business needs.
2. Implementation Phase
2.1. The project team supervises the tasks necessary to construct the new information system. There are a set of tasks that take place during this phase: 1. Purchase and install hardware and/or software. 2. Create applications. 3. Test applications. 4. Finalize documentation. 5. Train users. 6. Convert data. 7. Convert to new system.
3. Planning Phase
3.1. Consists of a set of activities: 1. Assemble the project. 2. Justify project. 3. Choose development methodology. 4. Develop a project schedule. 5. Produce a project development plan.
4. Design Phase
4.1. The project team must figure out how the new system will fulfill the requirements specified in the System Requirements Report. There are a list of activities for the Design Phase: 1. Identify potential solutions. 2. Evaluate solutions and select the best. 3. Select hardware and software. 4. Develop application specifications. 5. Obtain approval to implement the new system.
4.1.1. 1. Identify potential solutions
4.1.1.1. They might be more effective, less costly, or less complex. Therefore, it is not a good idea to proceed with the first solution that comes to mind. The project team should instead identify several potential hardware and software solutions by brainstorming and researching case studies at web sites and in computer publications.