Final answer:
True, replacing an overallocated resource with another resource is a legitimate method to resolve resource overallocations in project management, ensuring that the project remains on schedule.
Step-by-step explanation:
It is true that you can manually resolve a resource overallocation by replacing the overallocated resource with another resource. This process is part of resource management and is a critical component in project management practices. If a particular resource is scheduled to work more hours than are available, or if the skillset required for a task is more than what the resource possesses, it can lead to overallocation. In such cases, the project manager can look for another resource with the available time and the correct skillset to replace or supplement the overallocated resource. This may involve adjusting the project schedule, redistributing tasks, or even hiring additional staff to ensure the project remains on track.