ตัวอย่างการเขียน Context Diagram และ DFD Level 1

Given the following narrative description, compile an event-response list and draw a context diagram and Data Flow diagram Level1. State any assumptions.
          The purpose of the GREEN ACRES REAL ESTATE SYSTEM is to assist agents as they sell houses. Sellers contact the agency, and an agent is assigned to help the seller complete a LISTING REQUEST. Information about the house and lot taken from the request is stored in a file. Personal information about the sellers is copied by the agent into a seller file.
          When a buyer contacts the agency, he or she fills out the BUYER REQUEST. Every two weeks, the agency sends prospective buyers AREA REAL ESTATE LISTINGS and an ADDRESS CROSS REFERENCE LISTING, containing actual street addresses. Periodically, the agent will find the particular house that satisfy most or all of a specific buyer’s requirements, as indicated in the BUYER’s REQUIREMENTS STATEMENT distributed weekly to all agents. The agent will occasionally photocopy a picture of the house along with vital data and send the MULTIPLE LISTING STATEMENT (MLS) to the potential buyer.
          When the buyer selects a house, he or she fills out an OFFER that is forwarded through the real estate agency to the seller, who responds with either an OFFER ACCEPTANCE or a COUNTEROFFER. After an offer is accepted, a PURCHASE AGREEMENT is signed by all parties. After a PURCHASE AGREEMENT is notarized, the agency sends an APPRAISAL REQUEST to an appraiser, who appraises the value of the house and lotThe agency also notifies its finance company with a FINANCING APPLICATION.

จากตัวอย่างสามารถนำมาเขียนเป็น Context Diagramได้ดังนี้


 และ DFD Level 1 ได้ดังนี้





ไม่มีความคิดเห็น:

แสดงความคิดเห็น