Overview
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Design
Architecture vs Design
Design Challenges
Design Goals
Concepts
Standards Based Design
Data Standards
Design Patterns
Clinical Serialization Standards
Security Standards
Serialization Standards
Terminology Standards
Transport Standards
Stereographic Projection
Event-Driven Design
Cultural-Dependent Design
Service Interface Design
Contract-Based Design
Distributed Transaction Design
Testability Design
Code Generation Design
Science of Great User Experiences
Visual Design
Glossary

Unified Modeling Language (UML)

UML is a general-purpose modeling language for Software development that it is intended to provide a standard way to visualize the design of a system.

There are two aspects to UML:

There is the notation (which is rather complicated), and
There is a common set of abstractions.

UML knows many types of diagrams, that are divided into two categories:

Those that describe structure, and
Those that describe behavior.

Sources