In module 5, you created level 0 logical DFDs. Turn these into physical DFDs. Create the physical DFDs in Visio, export them to PDF, and combine into a single file. Upload the file the assignment box.

1. Create a set of use cases for the process of buying glasses from the viewpoint of the patient, but do not bother to identify the steps within each use case. (Just complete the information at the top of the use case form.) The first step is to see an eye doctor who will give you a prescription. Once you have a prescription, you go to a glasses store, where you select your frames and place the order for your glasses. Once the glasses have been made, you return to the store for a fitting and pay for the glasses.

2. Create a set of use cases for the following system: A Real Estate, Inc. (AREI), sells houses. People who want to sell their houses sign a contract with AREI and provide information on their house. This information is kept in a data- base by AREI, and a subset of this information is sent to the citywide multiple listing service used by all real estate agents. AREI works with two types of potential buyers. Some buyers have an interest in one specific house. In this case, AREI prints information from its database, which the real estate agent uses to help show the house to the buyer (a process beyond the scope of the system to be modeled). Other buyers seek AREIs advice in finding a house that meets their needs. In this case, the buyer completes a buyer information form that is entered into a buyer database, and AREI real estate agents use its information to search AREIs database and the multiple listing service for houses that meet their needs. The results of these searches are printed and used to help the real estate agent show houses to the buyer.

These two questions please make real physical DFDs, not just words