How to create a Level-1 Data Flow Diagram (DFD)

How to Create a Level 1 Diagram

Introduction to Level 1 Diagrams

• The speaker introduces the concept of a Level 1 diagram, which is one level deeper than a Level 0 context diagram that outlines an overall process for hiring.

• Acknowledges that sometimes the detail in a Level 0 diagram is insufficient, necessitating further decomposition into more specific processes.

Detailing the Scheduling Process

• Emphasizes the need for balanced diagrams; inputs and outputs must match in number and labeling when decomposing processes.

• Begins detailing the "scheduled interview" process, starting with reading application or availability information from applicants.

Steps in Scheduling Interviews

• Highlights that unlike Level 0 diagrams, Level 1 diagrams do not show external entities but focus on specific processes with incoming arrows representing data flow.

• Discusses selecting both applicant and engineering manager availability as crucial steps in scheduling interviews, assuming this task is performed by someone in human resources.

Finalizing Interview Schedules

• Describes creating and sharing the interview schedule as an outcome of the scheduling process, indicating it needs to be communicated to both managers and applicants.

• Mentions two distinct data flows resulting from this step: one for the manager's interview schedule and another for the applicant's interview schedule.

Visual Representation Challenges