Those are NOT cases of Project wrongly idifying overallocations. When a
resource is on two tasks that overlap and the assignment perecentage on both
is such that the total exceeds the maximum allowed percentage, the resource
is overallocated. For example, I have a resource who works an 8 hour day,
is allowed a maximum of 100%, and is assigned to 2 tasks. One task is 4
hours duration, the other is 2 hours. He's assigned 100% to each so he's
doing 4 hours work on 1 and 2 hours work on the other for a total of 6
hours. He's allowed to work 8 but he's only assigned to work 6, 75% of his
allowed time. Yet the name is in red indicating he's overallocated. Why?
The missing crucial piece of information is the times the tasks are
scheduled. One is currently scheduled to run from 8 to 12, the other is a
staff meeting from 8 to 10. Even though the totals appear to be okay,
between 8 and 10 he's expected to be in two places at once, doing a total of
4 man-hours of work in only 2 hours of time, a physical impossibility. One
of those tasks has to be delayed until it's moved clear of the other.