Although Project defines a task as critical if it has zero slack, you can change the definition of a critical task. For example, ...

Although Project defines a task as critical       if it has zero slack, you can change the definition of       a critical task. For example, you can make a task critical       if it has one or two days of slack. This can be helpful       if you want to be alerted to tasks becoming critical when       you still have a day or two of buffer.
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