Answers:
Fast calculation: Implies that project management software enables the user to perform accurate calculation within a very short span of time. For example, an Excel worksheet helps in managing a large chunk of data quickly, which is not possible manually.
Editing and modification of data: Implies that the changes in the work progress can be easily recorded by making necessary modifications in data, whenever required.
Quick updating of project progress: Refers to the automatic updating of project progress quickly and correctly. This helps in tracking the status of the project to determine its success or failure rate.