A Full Description Of The Two Use Cases: Draw A First-Cut Se

A Full Description Of The Two Use Cases2draw A First Cut Seq

1. Write a full description of the two use cases. 2. Draw a first-cut sequence diagram for each of the use cases that include problem domain classes and the data access layer. 3. Draw a first-cut sequence diagram that combines both use cases. 4. Draw an updated design class diagram that combines both use cases and includes classes, attributes, methods, and the updated navigation visibility.

Paper For Above instruction

Introduction

The task involves developing comprehensive models for two distinct use cases within a system. This includes detailed textual descriptions, sequence diagrams for individual use cases, a combined sequence diagram, and an integrated class diagram. This process supports understanding system interactions, data flow, and structural design, which are crucial for effective system implementation.

Full Description of the Two Use Cases

The two use cases selected for this analysis are "Customer Purchase Process" and "Product Return Process." Each provides a distinct interaction pattern within an e-commerce system, illustrating how users and system components collaborate to fulfill customer needs.

Use Case 1: Customer Purchase Process

This use case describes the steps a customer takes from browsing products to completing a purchase. Initially, the customer logs into the system, searches for desired products, and adds selected items to their shopping cart. Once satisfied, they proceed to checkout, enter payment and shipping information, and confirm the purchase. The system then processes the payment, updates inventory levels, and generates an order confirmation. Key problem domain classes involved include Customer, Product, ShoppingCart, Order, and Payment. The data access layer manages interactions such as retrieving product details, updating inventory, and recording transaction data.

Use Case 2: Product Return Process

This use case captures the scenario where a customer initiates a product return. After receiving the product, the customer logs into their account, locates the order, and requests a return specifying reasons. The system verifies the return validity, updates order status, and initiates refund processing. The involved problem domain classes are Customer, Order, ReturnRequest, and Refund. Data access operations handle validation, updating order statuses, and processing refunds.

Sequence Diagram for Each Use Case

The sequence diagrams depict the flow of interactions between objects for each use case, emphasizing how classes like Customer, Product, Order, and DataAccessObject collaborate.

Sequence Diagram 1: Customer Purchase Process

The customer initiates actions with the system, which interacts with product catalog, shopping cart, payment processing, and inventory management. The diagram visualizes message exchanges such as searchProduct(), addToCart(), checkout(), processPayment(), and updateInventory().

Sequence Diagram 2: Product Return Process

The customer requests a return, triggering interactions with order management, return validation, and refund processing. Messages include requestReturn(), verifyReturn(), updateOrderStatus(), and issueRefund().

Combined Sequence Diagram

The integrated diagram demonstrates how both use cases connect through shared classes and data flows. For example, a customer could perform a purchase and later initiate a return, with operations flowing through shared classes like Customer and Order, utilizing common data access functions.

Updated Design Class Diagram

The class diagram consolidates classes from both use cases, illustrating their attributes, methods, and navigation properties. Key classes include Customer, Product, ShoppingCart, Order, Payment, ReturnRequest, and Refund. Attributes encompass identifiers, statuses, and timestamps, while methods cover actions like addProduct(), processPayment(), requestReturn(), and issueRefund().

The diagram also indicates navigation visibility, showing which classes can directly access or modify other classes, ensuring system encapsulation and contract clarity. For example, Customer has navigational links to Order and ReturnRequest, enabling access to past orders and return histories.

Conclusion

Developing detailed descriptions, sequence diagrams, and class diagrams for these use cases enhances system comprehension and guides subsequent implementation. These models facilitate communication among stakeholders, serve as blueprints for developers, and support system robustness by clarifying interaction patterns and data management strategies.

References

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  • Pressman, R. S. (2014). Software Engineering: A Practitioner's Approach. McGraw-Hill.
  • Object Management Group. (2017). Unified Modeling Language (UML) Specification. OMG.
  • Awad, E. M., & Ragowsky, A. (2008). Establishing trust in electronic commerce transactions: The role of secure electronic delivery channels. Electronic Commerce Research and Applications, 7(3), 225-236.
  • Laudon, K. C., & Traver, C. G. (2021). E-Commerce 2021: Business, Technology, Society. Pearson.
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  • Jacobson, I., Rumbaugh, J., & Booch, G. (1999). The Object-Oriented Software Development Methods. IEEE Software, 16(5), 20-27.

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