Systems Analysis Part 2

During System Implementation

• the feasibility study is performed

• the new system is programmed and documented by the programmers

• the system analyst conducts interviews and distributes questionnaires

• the system is installed such that it will be ready for use

Changeover methods

• are four stages and each stage must be completed before moving onto the next

• consist of examining current business documents

• are methods used to switch from the old system to the new system

• consists of designing the new system

Direct Changeover

• means to switch off the old system and start using the new one.

• means to run both the old system and the new system simultaneously for a period of time.

• means to have the old system still active, but also to have parts of the new system installed in small chunks.

• is where the complete new system is first installed and tested in a small number of departments or branches.

Parallel Changeover

• means to switch off the old system and start using the new one.

• is where the complete new system is first installed and tested in a small number of departments or branches.

• means to have the old system still active, but also to have parts of the new system installed in small chunks.

• means to run both the old system and the new system simultaneously for a period of time.

Phased Changeover

• means to switch off the old system and start using the new one.

• means to have the old system still active, but also to have parts of the new system installed in small chunks.

• means to run both the old system and the new system simultaneously for a period of time.

• is where the complete new system is first installed and tested in a small number of departments or branches.

Pilot Changeover

• means to run both the old system and the new system simultaneously for a period of time.

• means to have the old system still active, but also to have parts of the new system installed in small chunks.

• is where the complete new system is first installed and tested in a small number of departments or branches.

• means to switch off the old system and start using the new one.

Control and Review

• is a set of steps involved in the process of creating a new or modified computerised system

• is time consuming as data has to be entered onto both systems

• is when the new computerised system is evaluated to ensure that it holds the user's original requirements

• is more expensive since it involves running two systems at the same time

Perfective maintenance

• is when the system must be changed according to the needs of the organization

• means that even though the system is running well, it still can be improved/tweaked

• is when over time, bugs/flaws/defects are discovered, that weren't picked up in the testing. These have to be fixed.

Adaptive Maintenance

• means that even though the system is running well, it still can be improved/tweaked

• is when over time, bugs/flaws/defects are discovered, that weren't picked up in the testing. These have to be fixed.

• is when the system must be changed according to the needs of the organization

Corrective Maintenance

• means that even though the system is running well, it still can be improved/tweaked

• is when over time, bugs/flaws/defects are discovered, that weren't picked up in the testing. These have to be fixed.

• is when the system must be changed according to the needs of the organization