Questions expose our uncertainty, and uncertainty has been our motive. The authors and contributors have aggregated this book and the series of books to follow in answer to questions covering the breadth and depths of orthodontics. This volume covers an orthodontic examination, anchorage, space planning and variants of malocclusions, including sagittal, transverse, vertical and local problems. Befittingly, the theme of this chapter is Mars to represent the importance of this volume. The book’s writing started with the amalgamation of orthodontic notes and the experience of the two primary authors, Dr Mohammed Almuzian and Dr Haris Khan. The other authors helped in proofreading, summarising the key points in the form of the ‘exam night re-view’. There have been numerous contributors to this book; as co-writers of specific chapters or as proofreaders, we seek to acknowledge them. To give credit where it is due, the roles of the authors and contributors of this volume are listed on the title page of each chapter.