System testing and implementation
performing a ysytem test
Testing is done all the way in system development. It is meant to turn up any unkown problem. Not to demonstrate the perfection of a program's manual or equipment. Though it is tediou, its help to assure the quality of the ventual system.
Stages of testing
1. Unit Testing
This involves testing of each individual module with test data to see if it's works as planned
2. Intergration testing
It's consist of intermodules and interprogram linkage test and program function
3. System test
The overal function perfomance of the system is tested. It checks the system for validity of the overal function and performance. The test results help to determine the time to initiate the service( This is usually conducted by the software developer)
4. Operational test
It's done in the actual operating environment to make a fined check to see if newly completed system is capable of actual operation. Mainly conducted by users who also see if the system has been exactly as per their expectation.
The analyst process an accurate assessment of the users that must be trained. The training strategic to be used to depend on who to be trained and who will train them.
Who to train
All the people who have the primary/secondary use of the system. It goes to the data entry personel to all the system users even those who will not come to contact with the hardware. The amount of training depend on how much one job will change because of the new system. Users of different key level and job difference must be seperated.
Below are some of training guidelines
- Establish measurable objectives
- Use appropiate training methods
- Select suitable training site
- Employee understandable training material
System Change over
Types of system change over
- Direct change over
- Parallel change over
- Gradual change over
1) Direct change over
This means on a specified date the old system is dropped and replace witha new system
- Long delays might occur since there is no possibility of reverting
- Users may reside to use unfarmiliar system
- There is no adequate way to compare new and old system
Parallel Change over
It refers to the running of an old and new system at the sametime. Once the new system is proved reliable, the old system is drop.
- There is more security when the new system fails then your can revert to the new system
- There is adequate way to compare new and old systemb
- Expensive to run both two system at the same time
- Very difficult to compare the out together
Gradual change over
- It's attempt to combine the best features of direct and parallel change over without carrying the direct link. The volume of transaction is gradually increased as the system is face out.
- Users can get a custom to the new system gradually
- Theposibility of detecting and recovery of errors without loosing a lot of time
- It's too long to get the new system in place
- Cannot be applied on large scale organization
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