Requirements have been defined, the data model is complete, source systems have been identified, tool selections have been made, and now the only thing left to do is connect the dots. Sounds easy, right? Designated with creating the extract, transform and load (ETL) architecture to move the source data into the warehouse, you begin drawing boxes and lines depicting the individual ETL processes that must be created in order to reconcile the idiosyncratic source system data into its generic business view of the world. The solution seems obvious: create an ETL process for each source you must introduce.
And they're off! The ETL analysts charge forward, creating the detail design (source-to-target mappings) for each of the processes you identified. However, upon reviewing said designs, you begin to discover that many of them are repetitively performing many of the same actions (and not always consistently). Maybe there's a better way.
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