4How To create DFD 1. Find out all possible entities. 2. Find out activity/process of system3. Find out additional activity/processConstruct Context-Level DFD , Level-1, and Level-2 DFDORConstruct Context-Level, Level-0 and Level-1 DFDConstruct Context-Level, Diagram 0, and Child Diagram
5Context-Level : Level-1 : Level-2 : Representation of Overview of Desired systemLevel-1 :Representation of Main Processes of SystemLevel-2 :Detailed Representation of Main Process (Representation of sub-processes)
7The University runs various diploma, graduation and post-graduation courses such as DE, DPharm, BE, MBA, MCA, ME, MPharm, etc. The courses follow semester pattern and under each course various subjects are taught. Students seek admission to these courses and if found eligible, the student is enrolled for the requested course. There are several faculty members in the University who teach the various subjects of these courses. The subject teacher conducts semester examinations for the concerned subject at the end of the semester and the students’ performance is recorded. Even if a student is unable to pass a subject, he is promoted to the next semester but has to reappear for that subject examination again and clear his backlog.Draw Context-Level, Level-1 and Level-2 DFDs
8Possible Entity and Processes StudentFacultyActivity/ProcessStudent RegistrationExaminationResultDFD Example :1
9Student Enrollment and Examination System Context LevelStudent Enrollment and Examination SystemStudentStudent RegistrationFacultyEnroll DetailExaminationResultDFD Example :1
11Get Data Student Detail for Registration Level - 2Process : 1Get Data Student Detail for Registration1.1Registration DetailRegistration DataD1StudentRegistration DataCheck for Eligibility1.2Valid Student DataD1StudentGet Enrollment Number1.3Enrollment No.DFD Example :1
15ABC project co. is a firm which hires approximately 350 engineers of different expertise. The company keep record of all employees, their skills, project assigned and their departments. New engineers are hired by the HR manager based on the data in the application form and evaluations collected from other managers who interview the job candidates. Employees may apply at any time of the year. Engineering managers notify the HR manager when a job opens and list the characteristics necessary for the candidate to be eligible for the job. The HR manager compares the qualifications of the available applicants with the qualifications specified by the engineering managers and the schedule the interviews between the managers and three best candidate from the pool. After receiving evaluations of each interview from the manager the HR manager makes the hiring decision based upon the evaluation and application of the candidate and the characteristic of the job and then notifies the interviewees and the manager about the decision. Applicants with rejected application are retained applications are retained for one year. When hired the new employee completes a nondisclosure agreement which is filled with other information of employee.Draw Context-Level, Level-1 and Level-2 DFDs.