To show real-time execution flow

To model the physical structure of a system

To describe the logic of complex processes

and workflows

To define object relationships

Validation

Verification

Evolution

Design and implementation

Process-oriented Approach – Focus on how NFRs can be used in the design process

Qualitative Approach – Study various relationships between quality goals

Quantitative Approach – Find measurable scales for the functionality attributes

Product-oriented Approach – Focus on system (or software) quality

Aggregation

Dependency

Realization

Generalization

Performance

Functionality

Design solutions

External Interfaces

Simplicity

Modularity

Code Optimization

Clarity and Completeness

Higher complexity in small projects

Reusability of code

Better maintainability

Improved security through encapsulation