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 lot. The agency also notifies its finance
company with a FINANCING APPLICATION.
จากตัวอย่างสามารถนำมาเขียนเป็น Context Diagramได้ดังนี้
ไม่มีความคิดเห็น:
แสดงความคิดเห็น