1. Please use Microsoft Visio and draw a level 0 data flow diagram (DFD).

Use Case Name: Maintain house seller information		ID: _1_	Importance Level: High
Primary Actor: Seller
Short Description: This describes how house sellers enter into a contract to sell and provide information on a house to sell.
Trigger: House seller wishes to sell house. Type: External / Temporal
Major Inputs: Description Source Sales Contract Seller House information Seller	Major Outputs: Description Destination NewSales Contract Contract file New_House Offered Houses file New_House_MLS Multiple listings file
Major Steps Performed 1. Seller signs contract and provides house information. Offered House database is updated with new listing information. Data on new listing is transmitted to Multiple Listings file.	Information for Steps Sales contract House information (seller) House information (seller) House information (new AREI listing) House information (AREI Offered Houses) House information (new MLS listing)

Use Case Name: Generate Buyers Request	ID: _2_		Importance Level: High
Primary Actor: Buyer
Short Description: This describes how buyers request and receive information on offered houses.
Trigger: Buyers request information on available houses. Type: External / Temporal
Major Inputs: Description Source Buyer information form Buyer House information request Buyer CurrentHouse information Offered houses file MLS_House information Multiple listings file		Major Outputs: Description Destination AvailableHouse info Buyer Buyer info Buyer file
Major Steps Performed 1. If buyer requests information on a specific house, retrieve that information from the offered house file. If buyer wants to search for several prospective houses, obtain a buyer information form from buyer. Search offered houses file and Multiple Listing file for houses matching buyers specifications and provide house information to buyer.		Information for Steps Buyer specific house search request House request search results Buyer information form Buyer multiple house search request House information search results