This article discusses the use of computer logging as a means of investigating aspects of the second language (L2) writing process as writers are engaged in producing text at the keyboard. The observation of writing by means of this method provides researchers with detailed information concerning aspects of the planning, formulation, and revision processes. This function is illustrated by reference to a study in Sweden of school-age learners of English as an additional language whose written production was recorded as part of a longitudinal study, and findings from the study are presented. The discussion highlights the potential uses of logging, not only not in relation to researching writers' processes, but also as a pedagogic tool given that its replay facility allows access to information about aspects of the writers' attention and strategies as they write. (Contains 1 figure, 4 tables, and 1 footnote.)