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Public procurement is prone to corruption, which in the global construction market alone accounts for an estimated US$340 billion per year. There is a growing need for procurement systems to be able to fight corruption and improve the effectiveness, efficiency, fairness and transparency of public procurement. A comprehensive list of irregularities in public procurement is derived from irregularities observed during technical vigilance inspections by experts and reported cases. The research involved a questionnaire survey, Delphi method and an empirical investigation of the dynamics of irregular practices in public procurement. The survey revealed the top 15 most frequent irregularities. The irregularities have been classified under five categories: transparency, professional standards, fairness, contract monitoring and regulation and procedural irregularities. The ranking of these categories reveals that transparency …