QA in a DW environment can be a really exciting experience.
One has to remember that the testing in a DW project is going to be White Box testing. QA person has to know the internals of the ETL, how data is extracted and filtered, and how reports are generated.
'Business Objects' is one such tool, that provides for the entire DW project. You can use its data integrator as an ETL tool. Other ETL tools include Integration Service (SSIS), Informatica etc.
Reports can generated using either BO's WEBi or Crystal Reports.
I have included project-specific information on my DW Blog.
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