Wednesday, January 9, 2008

Intersystem Testing Technique:

Background

§ Application systems are frequently interconnected to other application system.

§ The interconnection may be data coming from another application system, leaving for another application system or both.

§ Frequently multiple systems (applications) sometimes called cycles or functions are involved.

Usage

§ To ensure interconnection between application functions correctly.

Objectives

§ Determining –

- Proper parameters and data are correctly passed between the applications

- Documentation for involved system is correct and accurate.

§ Ensure Proper timing and coordination of functions exists between the application system.

How to Use

§ Operations of multiple systems are tested.

§ Multiple systems are run from one another to check that they are acceptable and processed properly.

When to use

§ When there is change in parameters in application system

§ The parameters, which are erroneous then risk associated to such parameters, would decide the extent of testing and type of testing.

§ Intersystem parameters would be checked / verified after the change or new application is placed in the production.

Examples

§ Develop test transaction set in one application and passing to another system to verify the processing.

§ Entering test transactions in live production environment and then using integrated test facility to check the processing from one system to another.

§ Verifying new changes of the parameters in the system, which are being tested, are corrected in the document.

Disadvantage

§ Time consuming

§ Cost may be expensive if system is run several times iteratively.

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