While tracking the project progress you can quickly update your project’s tasks by indicating the percentage of a task that is complete. It helps you to track actual progress.

By specifying a percentage of completion between 0 (for a task that has not started) and 100 (for a task that is finished), you can compare planned progress to actual progress.

You can quickly update the percent complete of specific tasks to 0%, 25%, 50%, 75%, or 100% using a Tracking toolbar

1. On the View menu, click Gantt Chart.
2. Display the Tracking toolbar   by pointing to Toolbars from the View menu, and then clicking Tracking.
3. Hold CTRL and click each of the tasks in the list that you want to update. You can select up to 10 tasks at once. Or, if the tasks that you want to update are listed consecutively, you can click the first task, hold SHIFT, and then click the last task to select the all of them.
4. Click corresponding percent complete button, such as 100% Complete   on the Tracking toolbar.