I am new to data warehousing. I am working on a DW project. The role of my team is to do system testing for the project. I would like to know how can we estimate the system testing effort for the project. Is there any standard method for estimating the effort required for system testing?
Clay Rehm’s Answer: Testing always seems to be the most misunderstood task of any software project. Many project teams even disagree on the scope, semantics and components of testing and how much testing really needs to be accomplished.
As you can see, there is more to testing than just "system testing!" The only real way to estimate how long testing will take is to involve the business users, the test team and the developers very early on in the project to develop a test strategy. Out of the test strategy will come a test plan more specifically you will get test cases and scenarios. Each scenario must be documented along with the expected result. Does this sound time-consuming? You bet! But how will you guarantee to your customers that your system does what it is supposed to do if you have not followed a detailed test plan?
A detailed test plan and test cases will really identify if the programming that was completed was done accurately and thoughtfully. Think of it this way the testing will prove or disprove the competence of your programmers, and how well the requirements were identified and followed.
Keep in mind that your users are identifying what the system will do. These are requirements, and IT has a terrible track record in properly identifying requirements. Each requirement should be achievable and testable. If a requirement is to make someone happy, how do you test that? You can’t! Your requirements must be at a more finite level.
If you think of testing as an extension of programming, and following a very detailed and thorough test plan, the time it takes to do it correctly would be easily double your programming effort.
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