The Congressional Research Service, a research arm of the Library of Congress, has published a very useful overview of the U.S. bid protest (bid challenge) system, by David Carpenter & Moshe Schwartz, Government Contract Bid Protests: Analysis of Legal Processes and Recent Developments (Updated November 28, 2018, CRS Report R45080), https://fas.org/sgp/crs/misc/R45080.pdf
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