Create a level 0 DFD

decompose Process 0 from your Context Level Diagram (your system) into Level 0 DFD to show the internal working processes of your system. Be sure to include:

The external entities (users and external systems)

Processes are uniquely numbered and labeled (remember, numbers are just for reference, they do not indicate order)

Data stores are uniquely labeled

Labeled inbound and outbound data flows (be sure to maintain inbound and outbound dataflows to external entities from context level DFD)

It is a best practice to start with your boundary data flows from your Context Level DFD to ensure you include all inbound and outbound data flows.

Requirements

The system shall allow students to request enrollment in a course

The system shall allow the registrars office to input courses but will only create new records if the course doesnt already exist in the system

The system shall allow the registrars office to input new student records but will only create new records if the student doesnt already exist in the system

The system shall send reports to the registrars office on course enrollment data

The system shall validate student enrollment requests against current course enrollments to not allow duplicate enrollment in the same course

The system shall enroll students in courses if they are not already enrolled

The system shall return a success or error message to students based on course enrollment transaction status

The system shall store data about all active students, including their unique student id, first name, last name, and email address

The system shall store data about all courses, including the unique class id, class subject, class number, and class name

The system shall store student enrollment data, including student id, class id, and enrollment date

Assumptions:

All students are active and eligible for enrollment

Students are not required to enroll in any course, and courses are not required to have any students

Students can only register for a course once

There are no prerequisites for any course

There is no enrollment capacity for each course

Here is what I have done.

Students 0 Enrollment Request Students 0 Enrollment Request Students 0 Enrollment Request Students 0 Enrollment Request