This book details the technical aspects of how to achieve requirements for clinical treatment planning aspects, including patient positioning, creation of patient specific bolus, beam angle configurations, and inverse planning optimization approaches. It is written for everyone involved in treatment planning including dosimetrists, physicists, and physicians. The book comprises of 14 chapters. The first three chapters are introductory chapters. Chapter one describes the types of treatment plans and the general process of treatment planning. The second chapter explains the principles and limitations of current inverse planning optimization algorithms, and discusses the application of auto-planning, knowledge-based planning, and multi-criteria optimization to overcome these limitations. The third chapter covers the available immobilization equipment and general principles of simulation, including patient safety procedures. Chapters four through eleven are organized by body site or system and covers central nervous system, head and neck, breast cancer, thoracic cancer, gastrointestinal radiotherapy, genitourinary cancer, gynecologic cancer, lymphoma, and soft tissue sarcoma. For each site, there is a description of patient simulation, including immobilization, setup, isocenter placement, and any special considerations such as motion management. The plan goals for each treatment site are tabulated, followed by recipes to achieve them from the simplest planning technique to the most advanced planning technique. For simple 3D conformal plans, the recipes include the field arrangement and portal shape design (both with many figures), beam weighting, and selection of dose normalization point. For advanced techniques such as intensity-modulated radiation therapy, volumetric modulated radiation therapy, and stereotactic body radiation therapy, the recipes provide details of creation of optimization structures and multiple stage optimizations. Each chapter concludes with plan evaluation, comparing achieved doses to the clinical planning goals. Chapter thirteen describes treatment planning for pediatric cancers. Chapter fourteen discusses treatment planning for palliative treatment.