The fifth edition's new co-author Stacey Lowery Bretz, uses visualisation tools—based on Chemistry Education Research and focused on the particulate nature of matter—to help students self assess what they know before, during and after each chapter. Smartwork5 allows instructors to use this pedagogy as a diagnostic and students receive hints and answer-specific feedback within the system. New ChemTour animations further support visualisation at a molecular level and are integrated throughout the media package.