5 questions need to be answered clearly.

it is 5 questions in Software Developing and planning. need to be answered clearly please. some of them need to draw use cases.

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1. Develop two personas and two use scenarios for a web site that sells some
retail products (e.g., books, music, clothes).
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
database 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 buy- ers. 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 AREI’s 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 infor- mation to search AREI’s 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.
3. Draw a level 0 DFD for the real estate system.
4. Draw an ISD for the DFD.
5. Describe the differences in the meanings between the two structure charts
shown. How have the symbols changed the meanings?

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