3- Functional requirements :

The system provides many services such as booking online sessions between trainer and trainee in a specific sport center , based on user availability and the trainer too.

Another main service that the system provides the trainer to book the needed equipment whenever its available.

The main cycle of the application is when the trainee books his session with a specific trainer , the trainer will get notify about it and need to accept it , finally the trainer needs to book for the equipment that is needed for the session.

The software that is used is a mobile application for its ease and comfortability with this type of projects.

A physical data flow diagram for the system and parts of the data dictionary should be submitted, as described below:

1. The context diagram of your DFD model
2. Diagram 0
3. Two child diagrams of any non-primitive process in diagram 0
4. A description of two of the data stores in your DFD as should be entered in the data dictionary
5. A description of 2 data structure in your DFD as should be entered in the data dictionary
6. A description of 3 data flows in your DFD as should be entered in the data dictionary
7. A description of 3 data elements in your DFD as should be entered in the data dictionary