Having one child makes you a parent; having two, you are a referee.
—British journalist David Frost
With SSIS, there are several ways to introduce modular programming into your ETL processes. One of the most flexible methods is by using the parent-child design. This pattern enables you to create packages to perform very specific tasks. If these tasks should be disabled, this design pattern allows you to utilize parameter bindings to disable functionality at the package level. As the quote suggests, the more complex your ETL process becomes, the more of an organizational role the parent package plays, rather than just the role of a package that calls another.
ETL processes can become increasingly ...