1. Draw the context diagram or Level 0 DFD for the following case/scenario. “The purpose of the SALALAH 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 reqeuest. Information about the house and lot taken from that request is stored in a file. Personal information about the sellers is copied by the agent into a sellers file. When a buyer contacts the agency, he or she fills out a 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 a particular house that satisfies most or all of a specific buyer’s requirements, as indicated in the buyer’s requisrements 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 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.”
1. Draw the context diagram or Level 0 DFD for the following case/scenario.
“The purpose of the SALALAH 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 reqeuest.
Information about the house and lot taken from that request is stored in a file. Personal information
about the sellers is copied by the agent into a sellers file.
When a buyer contacts the agency, he or she fills out a 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 a particular house that satisfies most or all of a specific
buyer’s requirements, as indicated in the buyer’s requisrements 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 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.”
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