In a real time application, the notion of time stands for the absolute time which is quantifiable. In contrast to real time, logical time, used in most general category applications, deals with a qualitative notion of time and are expressed using event ordering relations.

For example, consider the following part of the behavior of library automation software used to automate the bookkeeping activities of a college library: After a query book command is given by the user, the details of all the matching books are displayed by the software.