You never know for sure in advance how long it will take to complete an activity. The PlanMinder asks you about this uncertainty, and takes it into account when running the scheduler. Risks and uncertainties propagates through and between projects, and The PlanMinder can tell you how likely it is that you will reach a milestone on a certain date.
If you have a deadline, The PlanMinder calculates the probability of it being reached on time. This number is updated every time the scheduler is run. You can keep track of how it develops as the project progresses. If it starts to look bad, you can test what changes to the plan best increases the chances of success.
This gives you an early warning system, and gives you more time to act, and to avoid last minute crunch time and missed deadlines.