The report provides information about No. of due Tasks on each Project's Workflow by today, that means tasks, whose promised due date < today.
1. Click on "Due Tasks Summary" link, opens Due Tasks Summary report
Explanation about fields in the report:
1. Project - Project name in which due tasks are available
2. Workflow - Project's workflow name, in which due tasks are available
3. No. of Due Tasks - Count of the due Task in the Project's Workflow
Right click on a row in the above report and select "Due Tasks" in the pop menu shows list of due tasks in the Project's Workflow.