When a project manager identifies constraints and conditions that will prevent the project from being completed as initially planned, it is crucial to create a contingency plan. A contingency plan is a proactive strategy that describes the course of actions or steps the project manager and team will take to respond to potential issues. This plan can help manage risk that might arise from changes or uncertainties in the project. It is part of the broader risk management process in project management, which also includes identifying, assessing, and prioritizing risks. References:
https://www.coursera.org/articles/project-management-lifecycle
https://www.pmi.org/learning/library/delayed-projects-schedule-strategy-10148