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A change directive is a formal method used during a construction project to authorize a change in work when immediate action is required. This procedure ensures that the contractor can proceed with the necessary work without waiting for a lengthy negotiation or agreement on a change order. The directive outlines the required changes and instructs the contractor to proceed with the work, while also setting the stage for future discussion regarding compensation and time adjustments.

Using a change directive protects both the owner and the contractor by documenting the necessity for the change and providing clear instructions, which helps maintain project momentum and mitigates potential delays. This approach is particularly crucial in situations where an issue arises that could significantly impact the project timeline or safety, requiring prompt attention to maintain the integrity of the construction process.

Other options, while they may seem plausible for handling changes, do not provide the immediate authorization needed to carry out work without delay. Options involving supplemental instructions or proposals could lead to uncertainty and stalling of essential work, while having the contractor anticipate and execute work without formal approval can lead to disputes regarding responsibility and payment later on. This makes the change directive the most effective procedure for immediate implementation of necessary changes in construction work.