Section I. Understanding digital citizenship -- chapter 1. A brief history of digital citizenship -- chapter 2. The nine elements of digital citizenship -- section II. Digital citizenship in schools -- chapter 3. Creating a digital citizenship program -- chapter 4. Professional development activities in digital citizenship -- section III. Digital citizenship in the classroom -- chapter 5. Teaching digital citizenship to students -- chapter 6. Foundational lessons in digital citizenship -- chapter 7. Guided lessons in digital citizenship -- Conclusion.