Understanding digital citizenship: Basics of digital citizenship -- Nine elements of digital citizenship -- Digital citizenship in schools: Creating a digital citizenship program -- Professional development activities in digital citizenship -- Digital citizenship in the classroom: Teaching digital citizenship to students -- Foundational lessons in digital citizenship -- Guided lessons in digital citizenship -- Appendixes: Appendix A: Definition of terms -- Appendix B: Bibliography -- Appendix C: ISTE national educational technology standards for students, teachers, and administrators.