Book excerpt: Teachers, as life-long learners, engage in professional development to deepen their understanding of content and instructional methods. Teacher professional development is a form of adult education, and adults learn best if they are actively involved in their own learning and see it relative to their own needs. Grounding professional development in actual classroom practice is a highly powerful means of fostering effective teachers. Research has shown that, for professional development to be effective, several components of instruction should be considered: reflection on practice, problems arising in practice, subject matter content, and principles of adult learning. Practice-Based Professional Development in Education is a cutting-edge research publication that explores both effective and ineffective professional development practices and presents arguments for why adult learning theory should be considered when designing a professional development session. Highlighting a range of topics including social media, education reform, and teacher learning, this book is essential for teachers, academicians, education professionals, policymakers, curriculum designers, researchers, and students.