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Why Undocumented Legacy Scripts Are the Hidden Risk in Government IT Modernization

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Government modernization efforts frequently focus on replacing visible legacy applications while ignoring the small, undocumented scripts that quietly keep critical workflows running. A recent GAO Inspector General report highlighted a parallel problem: key decisions about modernization strategy went unrecorded, leaving current officials without the rationale behind past choices. Experts warn that automated file-transfer scripts often encode important operational policies — such as file validation rules, retry logic, and timing dependencies — that exist only as code flags understood by a handful of people. Modernization teams are advised to observe and document existing script behavior across multiple cycles before attempting any rewrite, capturing schedules, dependencies, and informal human workarounds. Requirements should be written as testable, observable outcomes, and timing relationships between upstream and downstream systems must be mapped as carefully as the file transfers themselves.

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