Question

ANSWER ALL QUESTIONS CASE STUDY: Coronavirus Outbreak Due to the outbreak of Coronavirus, Mauritius has been in lockdown for a month starting from the 18th of March 2020. The population has been discouraged to go out to prevent the spread of the virus. People will need food and medicine. Company XYZ has come forward with a brilliant solution to help the Mauritian citizen to buy food, medicine or other stuff without leaving their homes. The company XYZ has developed a web application for those who have internet access. For those without internet, the company is proposing a food caravan. Through the web application, a customer can view any item he/she wants to purchase but he/she needs to register first. Once registered, he/she can to log on. He/She can add to their personal basket. He/She make an online payment by specifying the delivery address. Each purchase is properly labelled with the purchaser’s name and delivery address. The customer can also request an item not available from the list. The system keeps a list of suppliers and related items they sell. Suppliers may be retail shops, supermarkets, pharmacies and other appliances shops. Suppliers must register. They can propose a list of items for sale. Suppliers can view their sales figures online. They can also view detailed sales. The food caravan is a small retail shop. There will be few caravans operating in different regions of the country each day. The schedule of each caravan will be decided one day before. They will sell only basic food stuffs. For each caravan, a driver and a helper will be responsible for the sale and delivery. The caravan is equipped with a tablet with internet access. The driver or helper will quickly register a client. The client will be asked which item he/she wants to buy. All this information will be fed to the web application instantly. The client can pay cash or with cards. People can also request items not available in the caravan. The next time, a caravan may bring the item requested by potential clients. Each caravan will be equipped with a GPS system. The admin staff can have real-time tracking of the caravans. Admin staff can update the system for a new schedule of a particular caravan. The admin staff can view daily sales. Page 3 of 4 ANALYSIS AND DESIGN (SDT2101C) SITE/August 2022 Semester1 QUESTION 1: (57 MARKS) Refer to the Case Study:

(a) What is the purpose of a use case diagram? (3 Marks)

(b) Draw a use case diagram for the above case study. You may consider other features not mentioned in the case study (35 Marks)

(c) Write the use case specification for any of the above uses cases. (7 Marks)

(d) Draw an appropriate class diagram. (12 Marks)

Answer 1

A use case diagram is a visual representation of the interactions between actors and the system being developed. It helps to define the scope and requirements of the system. An example use case specification for the 'Register Customer' use case is provided. A class diagram can be drawn to represent the different entities and their relationships in the system.

Step-by-step explanation:

A use case diagram is a visual representation of the interactions between actors (users) and the system being developed. It shows the different ways that actors can interact with the system and the specific functionalities that the system provides. Use case diagrams are used to define the scope and requirements of the system being developed, and they help to identify potential scenarios and user goals.

In the case study provided, a use case diagram can be created to represent the different interactions between users (customers, suppliers, admin staff) and the web application and food caravan systems. The diagram would include use cases such as 'Register Customer,' 'Log In,' 'Add Item to Basket,' 'Make Online Payment,' 'Register Supplier,' 'View Sales Figures,' and 'Update Caravan Schedule,' among others.

Use case specification for any of the above use cases:

• Use Case: Register Customer
• Actor: Customer
• Description: This use case allows a customer to register on the web application.
• Preconditions: The customer has internet access and has accessed the web application.
• Basic Flow:
  1. The customer selects the 'Register' option on the web application.
  2. The system presents a registration form to the customer.
  3. The customer fills in the required information, such as name, email address, and password.
  4. The customer submits the registration form.
  5. The system validates the information provided by the customer.
  6. If the information is valid, the system creates a new customer account and sends a confirmation email to the customer.
• Alternative Flow:
  1. If the information provided by the customer is not valid, the system displays an error message and allows the customer to correct the information.
  2. If the customer already has an account, the system displays an error message.
• Postconditions: The customer has a registered account on the web application and can log in to access the functionalities.
• Exceptions: None

An appropriate class diagram for the case study can be drawn to represent the different classes and their relationships in the system. The classes would include 'Customer,' 'Supplier,' 'Item,' 'WebApplication,' 'FoodCaravan,' and 'AdminStaff,' among others. Relationships between the classes would include associations, generalizations, and aggregations depending on the specific relationships between the entities.