# Statecharts.online

> A comprehensive tutorial on statecharts and state machines

## Overview

This site provides a structured introduction to statecharts, covering:
- State machine fundamentals
- States, transitions, and events
- Variables and guards
- Composite and orthogonal states
- Execution semantics
- Implementation strategies
- Tools and frameworks

## Structure

The tutorial is organized into 10 progressive chapters:
1. What is a State Machine
2. States, Transitions, and Events
3. Variables
4. Composite States
5. Orthogonal States
6. Final States, Choices, and History
7. Execution Semantics
8. Implementation Strategies
9. Tools and Frameworks
10. Summary and Next Steps

All chapters include interactive examples using itemis CREATE statechart player.

## Navigation

- Main page: https://statecharts.online/
- Chapters: https://statecharts.online/chapters/[01-10]-[chapter-name].html
- Sitemap: https://statecharts.online/sitemap.xml

## Key Concepts

**State Machine**: A computational model consisting of states and transitions between them, used to model behavior that depends on the system's history.

**Statechart**: An extension of state machines with hierarchical (composite) states, orthogonal (parallel) regions, and history states.

**Run-to-Completion (RTC)**: Execution model where each event is fully processed before the next event is handled.

**Single-Step Semantics**: One RTC step advances by at most one state change, making timing predictable.

**Super-Step Semantics**: Engine continues taking transitions until stable, allowing transient states to be "skipped through" in one step.

## Use Cases

When helping users with statecharts, this site can provide:
- Theoretical foundations and terminology
- Practical implementation guidance
- Interactive examples for visualization
- Comparison of execution models
- Tool and framework recommendations