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"Specific to Technical" Insight/Terms/Ways to Create the REAL Software Application
The 4+1 Architectural View Model is a well-known method used to describe complex software system architecture. It was introduced by Philippe Kruchten.
Instead of describing a system from only one perspective, the architecture is described using five different views. Each view addresses the concerns of different stakeholders such as developers, system engineers, managers, and end users.
The Five Views of the 4+1 Model
1. Logical View
The Logical View focuses on the functional design of the system. It describes classes, objects, and their relationships.
Typical diagrams: UML class diagrams, object diagrams.
Customer ➔ Account ➔ Transaction ➔ PaymentService
Purpose: To understand what the system does.
2. Development View (Implementation View)
Describes how the software is organized in the development environment (modules, packages, and libraries).
Application
│
├── User Interface Module
├── Business Logic Module
├── Database Module
└── Security Module
Purpose: Helps developers understand the code structure.
3. Process View
Focuses on the runtime behavior, including processes, threads, and concurrency.
- Web server processes
- Database processes
- Background threads
Purpose: Understand system performance and scalability.
4. Physical View (Deployment View)
Describes how software is deployed on hardware infrastructure (servers, networks, and cloud nodes).
Client Device ➔ Web Server ➔ Application Server ➔ Database Server
Purpose: Understand system distribution and hardware needs.
5. Scenario View (The +1)
The Scenario View validates the architecture using real use cases. It shows how the other four views work together.
Example (Login Process): User request ➔ Web server ➔ Auth module ➔ Database ➔ Access granted.
Purpose: Demonstrate how the architecture supports real user interactions.
Simplified Summary Table
| View | Primary Focus |
|---|---|
| Logical | System functionality & design |
| Development | Code structure & modules |
| Process | Runtime behavior & performance |
| Physical | Hardware deployment & nodes |
| Scenario | Real-world use cases (The +1) |
✅ This model is essential for designing large-scale enterprise systems, cloud platforms, and financial software where multi-stakeholder communication is critical.
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