Question: One of our internal divisions outsourced their data warehouse. Now they want to bring it back in house. What factors should be considered and what are the risks?

Sid Adelman's Answer: The first question is how much was actually outsourced. Was it the data modeling, the database design, the ETL process, the query and report creation or all of the above? The biggest risk might be the absence of internal people who understand the system and can perform the necessary DW roles. I hope no one was fired when that division was outsourced. If your internal people are not trained, they will need to be, and you will need to give them enough time to ramp up their skills with the DW products and enough time to learn what the outsourcer has developed. Another risk might be the level of the outsourcer's documentation. A further major risk is the outsourcer not being thrilled about losing your business and their less than stellar cooperation as you bring what was once theirs under your wing.

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