To construct basic structural, behavioral, and architectural models using the K6 (Create Level) in the Object-Oriented Software Engineering (OOSE) approach, we use UML diagrams to model a software system’s components.

Below is a detailed breakdown showing how to create these models using appropriate UML diagrams for each category:

🔹 1. Structural Model – "What" the system is made of

✦ Purpose:

To define the static aspects of a system — the classes, their attributes, methods, and relationships.

✦ UML Diagram Used:

Class Diagram

✅ Example: Library Management System (Structural View)

Classes:

• Book – Attributes: title, ISBN, author

• Member – Attributes: name, memberID

• Librarian – Attributes: employeeID, name

• Loan – Attributes: issueDate, returnDate

Relationships:

• A Member can borrow multiple Books (1..*)

• Loan connects Book and Member

• Librarian issues Loans

This class diagram shows associations, multiplicities, and possibly inheritance (e.g., Staff → Librarian).

🔹 2. Behavioral Model – "How" the system behaves over time

✦ Purpose:

To define dynamic behavior: interactions, events, workflows, and responses to stimuli.

✦ UML Diagrams Used:

• Use Case Diagram

• Sequence Diagram

• Activity Diagram

• State Diagram

✅ A. Use Case Diagram

Actors:

• Member

• Librarian

Use Cases:

• Search Book

• Borrow Book

• Return Book

• Add New Book

Connect actors to use cases to define user interaction with the system.

✅ B. Sequence Diagram (e.g., Borrow Book process)

Objects:

• Member

• Librarian

• Book

• LoanSystem

Flow:

1. Member requests to borrow a book.

2. Librarian checks book availability.

3. If available, creates a Loan entry.

4. Updates book status to "Issued".

✅ C. Activity Diagram (e.g., Returning a Book)

Flow:

• Start → Scan Book → Check Due Date → Update Status → Generate Fine (if overdue) → End

✅ D. State Diagram (e.g., Book Object)

States:

• Available → Issued → Reserved → Lost

Shows transitions triggered by actions like "Borrow", "Return", or "Reserve".

🔹 3. Architectural Model – "Where" and "how" the system is deployed and structured

✦ Purpose:

To define the high-level components, their organization, and deployment.

✦ UML Diagrams Used:

• Component Diagram

• Deployment Diagram

✅ A. Component Diagram

Components:

• UI Module

• Business Logic Module

• Database Module

Dependencies:

• UI interacts with Business Logic

• Business Logic interacts with Database

Helps visualize software modularization.

✅ B. Deployment Diagram

Nodes:

• Client Device (with UI)

• Application Server (with business logic)

• Database Server

Artifacts:

• Show software components installed on hardware nodes

✅ Summary Table:

Let me know if you'd like me to generate sample diagrams or provide a case study example for implementation.