At This Point, You Are Ready To Execute The Next Phase In Sy

At This Point You Are Ready To Execute The Next Phase In System Devel

At this point, you are ready to execute the next phase in system development life cycle (SDLC), which is the design phase. Exploiting the research that you have performed in this week’s Discussion Board on the set of modeling tools, document the design for the application project that you selected. Assignment For this assignment, you will use Visio Software Application to develop the design employing the following computer-aided software engineering (CASE) modeling tools: Use case Functional decomposition diagram Entity-relationship (E-R) diagram, data flow diagram (DF), or class diagram Sequence diagram Mock-up or storyboard of the user interface screens. The project deliverables are as follows: Update the System Requirements, Design, and Implementation Specification title page with new date. Update the previously completed sections based on the instructor's feedback. System or Application Design Develop a high-level use case to represent the application as a whole. Develop a functional decomposition diagram to show all of the functions that the system or application will support. Develop an E-R diagram, class diagram, or a data flow diagram that effectively represents the data that are required for your application or system. Develop a sequence diagram to represent the timing of various activities within the application or system. Develop a mock-up or storyboard for the high-level interface screens. Name the document "yourname_IT425_IP2.doc."

Paper For Above instruction

The design phase of the System Development Life Cycle (SDLC) is critical as it translates the requirements gathered during the analysis phase into detailed specifications that guide the development process. This phase involves creating comprehensive models that visually and functionally depict how the system will operate, interact, and appear to end-users. Leveraging tools such as Microsoft Visio allows system analysts and designers to produce precise diagrams and mock-ups, which serve as blueprints for developers and stakeholders alike (Loucopoulos & Karakostas, 1995).

High-level Use Case Development

The initial step in the design phase involves formulating a high-level use case that encapsulates the entire application. This use case provides an overarching view of the system's primary functionality from the user's perspective, highlighting key interactions and goals. For example, in an e-commerce application, the high-level use case might be "Process Customer Purchase." This narrative outlines how customers browse products, add items to their cart, and complete transactions, setting the scene for more detailed design models (Cockburn, 2000).

Functional Decomposition Diagram

The functional decomposition diagram (FDD) breaks down the high-level use case into smaller, manageable functions, illustrating how the system’s features are subdivided into sub-functions. This hierarchical structure clarifies the relationships and dependencies among functions, such as inventory management, order processing, user authentication, and payment processing. An FDD ensures that developers understand each facet of system functionality and helps in identifying modular components for implementation (Yourdon & Constantine, 1979).

Entity-Relationship (E-R) Diagram

The E-R diagram models the data entities involved in the system and elucidates the relationships among them. For an application like an inventory management system, entities such as "Product," "Supplier," and "Order" are identified. Attributes of each entity are defined, and relationships such as "supplies" or "places" are established with cardinalities. This diagram guarantees a clear understanding of data requirements and supports database design (Chen, 1976).

Sequence Diagram

The sequence diagram illustrates how system components interact over time during specific scenarios. For instance, a sequence diagram for a user login process details the sequence of messages exchanged between the user interface, authentication server, and database. This visualization ensures clarity on timing, order of operations, and interactions necessary for system procedures (Jacobson, 1992).

Mock-up or Storyboard of User Interface Screens

Creating a mock-up or storyboard of the user interface provides a visual representation of the application's screens, enhancing usability and user experience design. High-level mock-ups might include wireframes of the homepage, login screen, dashboard, and transaction pages. These visuals serve as prototypes for stakeholder feedback and guide developers during the UI implementation phase (Nielsen, 1994).

Overall, these modeling tools collectively provide a detailed, visual, and functional blueprint of the system. They facilitate effective communication among stakeholders, ensure that requirements are accurately transformed into design, and serve as foundational documentation for subsequent development phases. Proper utilization of Visio to produce these diagrams ensures consistency, clarity, and professionalism in system design documentation, ultimately leading to a more efficient and successful system development process (Pressman, 2014).

References

  • Chen, P. P. (1976). The entity-relationship model—toward a unified view of data. ACM Transactions on Database Systems, 1(1), 9–36.
  • Cockburn, A. (2000). Writing effective use cases. Addison-Wesley.
  • Jacobson, I. (1992). Object-oriented software engineering: A use case driven approach. Addison-Wesley.
  • Loucopoulos, P., & Karakostas, H. (1995). Systems analysis and design methodology. McGraw-Hill.
  • Nielsen, J. (1994). Usability engineering. Morgan Kaufmann.
  • Pressman, R. S. (2014). Software engineering: A practitioner's approach (8th ed.). McGraw-Hill.
  • Yourdon, E., & Constantine, L. L. (1979). Structured design: Fundamentals of a discipline of computer program and systems design. Prentice-Hall.

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