Question

Starting with a context diagram, draw as many nested DFDs as you consider necessary to represent all the details of the employee hiring system described in the following narrative. You must draw at least a context and a level-0 diagram, plus Level 1 and Level 2 where needed. If you discover while drawing these diagrams that the narrative is incomplete, make up reasonable explanations to complete the story. Supply these extra explanations along with the diagrams.

Projects, Inc., is an engineering firm with approximately 500 engineers of different types. The company keeps records on all employees, their skills, assigned projects, and the departments they work in. New employees are hired by the personnel manager based on data in an application form and evaluations collected from other managers who interview the job candidates. Prospective employees may apply at any time. Engineering managers notify the personnel manager when a job opens and list the characteristics necessary to be eligible for the job. The personnel manager compares the qualifications of the available pool of applicants with the characteristics of an open job and then schedules interviews between the manager in charge of the open position and the three best candidates from the pool. After receiving evaluations on each interview from the manager, the personnel manager makes the hiring decision based upon the evaluations and applications of the candidates and the characteristics of the job and then notifies the interviewees and the manager about the decision. Applications of rejected applicants are retained for one year, after which time the application is purged. When hired, a new engineer completes a nondisclosure agreement, which is filed with other information about the employee.

Answer 1

The given system will have below entities in it:

Job Candidates

Personnel Manager

Engineering Manager

Context Diagram:

Context diagram in a system shows the interaction of different entities with the system:

DFD Level 0 Diagram:

Level 0 DFD diagram shows the overall system flow with its entities and data stores.

Along with entities, system DFD level 0 diagram will have below Data stores (DS)

· DS_JobOpenings

· DS_CandidateApplications

DFD Level 1 diagram:

DFD Level 1 diagram is more detailed diagram which drills down the processes of DFD level 0.

The system will have below sub processes:

DFD Description:

The DFD shows the follow data flow in the system:

· Engineering Manager notifies the system about new opening with qualifications required.

· Job opening is saved in the data store.

· Job Candidate can view job opening any time and apply for required open position.

· Job applications are stored in the data store.

· Personnel manager takes the job opening and candidate applications.

· Selects top three candidates for interview

· Interviews are stores in data store.

· Engineering manager and candidate attempts the interview where engineering manager evaluates the candidate.

· Personnel manager takes decision as per the evaluation and notify about the results to engineering manager as well as candidate.

· When candidate is selected his details are entered in employee data store.

· Old candidates are deleted by personnel manager time to time.