Progress information based on what actually happened is usually referred to as project actuals. Actuals are made up of data like actual duration, actual start, actual work, and percent complete. (The box on Updating Task Progress explains the difference between baseline, scheduled, and actual values in Project.)
In this section, you learn how to enter actual progress information into your Project file, including the best dialog boxes, tables, and fields for this purpose. This section covers more popular techniques for tracking progress in Project. Some techniques update from the task's point of view, and other techniques update from the resource assignment's point of view. You also learn how to quickly "catch up" to your project if it's gotten stalled for some reason. Finally, you'll learn about the best ways to update cost information in your project.
Although you can also enter remaining information, such as remaining duration or remaining work, those are not considered actuals. That information is a readjustment of the estimate of time yet needed in the future to complete the task.