Graphematics is the part of a theory of writing systems that refers to the relationship between written forms and sound forms. Essentially, the point at issue is how written forms can be represented in sound. Accordingly, the study examines the phonetic correspondence potential of all the letters of the German alphabet, as well as the lengthening and sharpening phenomena reflected in the system of written German. The study formulates essential requirements for an analysis of orthography and provides relevant arguments for debates on spelling and other reforms.