The guide provides a practical approach to the diagnostic and therapeutic procedures for reading and writing disorders (RWD). It begins with an overview of the current state of research regarding the symptoms, classification, epidemiology, and etiology, as well as the progression, support, and early detection of the disorder. Detailed guidelines for diagnostics and monitoring, treatment indications, and interventions are formulated, along with their implementation in practice. The process of family and school exploration, as well as the exploration of the affected individual during the clinical examination, is described. Testing methods for assessing reading and/or writing performance, as well as intelligence, are outlined. Additionally, the diagnostics of accompanying psychological disorders and children with German as a second language are addressed.