Final answer:
To ensure no double-booking with resource leveling techniques, project scheduling software or systems must be utilized. These systems consider individual availability, preventing overallocation, and analytics features are used to validate proper resource allocation.
Step-by-step explanation:
To verify that resource leveling techniques have not double-booked anyone even after all holidays and vacation time are taken into account, a project manager or scheduler must ensure comprehensive scheduling software or systems are in place. These systems typically have features that track the availability of each team member. When resource leveling is performed, it takes into account each individual's workload, capacity, and availability, which should include holidays and vacation times, preventing overallocation.
After performing resource leveling, validation involves checking the resource allocation to make sure that no individual is assigned to multiple tasks concurrently beyond their capacity. It's often completed through the software's reporting and analytics features, which can highlight any potential overallocation. The system should flag any instances where a resource is double-booked, and adjustments can then be made to the schedule accordingly.