Correction of errors is a major part of the editor's task. However, the definition of what is an error, and what is correct, is not clearcut; rule transformations and reader context can affect the dividing line between the two. The author examines the concept of error from phenomenological and rhetorical perspectives, and suggests a model based on communication economics.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>