1. Supply chain management policies adopted under section 38 of the Public Finance Management Act 1 of 1999, which form part of the legislative framework applicable to tenders, may validly provide that bidders who decline or fail to respond to invitations to extend tender validity periods may be excluded from further assessment, allowing the procurement process to continue with bids from bidders who agreed to the extension. 2. A tender validity period may be lawfully extended where the Department invites bidders to extend before expiry of the period, and proceeds to assess bids only from those bidders who accept the extension, provided this process is authorized by applicable supply chain management policies. 3. A public body may lawfully exclude a bidder from tender consideration based on credible evidence of serious malfeasance (such as material misrepresentations) in prior tenders, even in the absence of a final finding of guilt or formal listing on the Treasury restricted suppliers database, where such evidence includes findings by statutory investigative bodies and acknowledgements in settlement agreements before tribunals.