When faced with a delay in a critical path activity, it is prudent for the project manager to thoroughly evaluate the proposed fallback plan, considering its impact on the project’s scope, time, cost, and quality. If the fallback plan is viable and justifies the additional cost, the project manager should proceed with submitting a change request. This process involves documenting the proposed changes, assessing the benefits and risks, and seeking approval from the project sponsor or change control board. The change request should detail the reasons for the deviation from the original plan, the expected outcomes, and the justification for the additional expenditure. This approach ensures that any alterations to the project are well-considered, transparent, and formally approved, maintaining the integrity of the project management process123.