A Bilateral Modification (FAR 43.103(a)) is a contract change signed by both the contractor and the contracting officer. Used for supplemental agreements that modify terms by mutual consent, such as adding scope, extending the period of performance, or adjusting pricing. Both parties must agree to the modification terms.
is a process concept federal contractors and grant writers run into across solicitations, regulations, and award filings
Bilateral Modification is a step or workflow in the federal-procurement lifecycle. Knowing where Bilateral Modification fits in the larger acquisition arc — from market research through award through performance — helps contractors time their engagement, identify the right contracting officials, and avoid showing up too late to influence the requirement. Many proposal failures trace back to misunderstanding when Bilateral Modification occurs, who owns it, and what artifacts it produces. The related terms above name the adjacent process steps that most commonly precede or follow Bilateral Modification, and tracking those transitions over time is one of the more reliable ways to build pipeline visibility ahead of formal solicitations.
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