To keep your project on schedule, you need to make sure that tasks start and finish on time as much as possible. Of course, there will always be tasks that don’t start on time or take longer than expected. It’s important to find tasks that vary from the baseline plan as soon as possible, so you can adjust task dependencies, reassign resources, or delete some tasks to meet your deadlines.
You need to have saved a baseline in order to have variance information.
To determine if tasks are starting and finishing according to plan
.