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# Data Flow Diagrams for Voter Registration System A Data Flow Diagram (DFD) represents the movement of data through a system. In a Voter Registration System, the DFD shows how information related to voter registration is collected, verified, stored, updated and used to generate voter-related records. The system involves voters, registration officers, verification authorities, databases and election administrators. DFDs can be developed at different levels. The Context Diagram represents the entire system as a single process, while Level 1, Level 2 and Level 3 DFDs progressively decompose the system into more detailed processes. Context Diagram / Level 0 DFD At the highest level, the complete Voter Registration System is represented as one process. ```text Personal & Registration Details ─────────────────────────────────────► +-----------------------------------------------+ | | | VOTER REGISTRATION SYSTEM | | | | | +-----------------------------------------------+ ▲ │ │ │ Registration Status, Voter ID / Verification Result Registration Details │ ▼ VOTER ELECTION AUTHORITY ``` The external entities are primarily the Voter and Election Authority/Registration Officer. The voter provides personal information, address, age, identity documents and other required details. The system processes this information and returns registration status, verification results and voter identification information. The election authority provides verification decisions, administrative instructions and may receive voter-registration reports. Level 1 DFD The main Voter Registration System can be decomposed into the following major processes: 1.0 Receive Voter Application 2.0 Verify Voter Details 3.0 Process Registration 4.0 Maintain Voter Records 5.0 Generate Reports and Notifications The main data stores are: * D1: Voter Application File * D2: Identity/Document File * D3: Voter Database * D4: Electoral Roll * D5: Registration Transaction File ```text Voter │ │ Application Details ▼ +-----------------------+ | 1.0 Receive Voter | | Application | +-----------------------+ │ │ Application Data ▼ +-------------+ | D1 Voter | | Application | | File | +-------------+ │ ▼ +-----------------------+ | 2.0 Verify Voter | | ___ ____ ____ ______ _____ ________ _________.
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