Many times this step can be skipped if Organization is ready to implement the data warehouse and clear about why they need a data warehouse. Following points can help you to successful execution of this step.
1. Get the most talented and experience people in this step as there past experience in data warehouse design will help a lot to design a prototype fast.
2. Make sure you implement the prototype in a manner which can be further reused in actual development.
3. Document the prototype
5. Use ready to use tools instead of using any high level language to create a tool to use in prototype. This will help to save time.
6. Create sample Data warehouse with sample data in it which can feed 2-3 reports.
7. Present the prototype to end users to get a feel of proposed solution.
8. Once done, Get sign off on prototype.
Remember prototype is a very small part of your actual development project. It needs to done fast. If Business Users like your prototype success of Data warehouse project is very near.
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