Philip Luelsdorff's highly original approach to the grammar of orthography is to analyse in detail how German pupils learn about written English. In this collection of essays and experiments we are presented with the rich finds of a decade of programmatic research. The context is set with an exposition of current cognitive models of reading and spelling. Cognitive psychology and psycholinguistics meet in Luelsdorff's concept of linguistic error. This concept forms the basis from which it is possible to derive the grammar that governs our largely unconscious and vast knowledge of written words.