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In page Application discovery and understanding:

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When a developer can browse the metadata, and drill down into relevant details on demand, then application understanding is achieved in a way that is natural to the developer.[5] Significant reductions in the effort and time required to perform full impact analysis have been reported when ADU tools are implemented. [6] ADU tools are especially beneficial to newly hired developers. A newly hired developer will be productive much sooner and will require less assistance from the existing staff when ADU tools are in place.[7]