Journal of ENGLISH for ACADEMIC PURPOSES Journal of English for Academic Purposes 5 (2006) 302–316 Examining the theory/practice relation in a high school science register: A functional linguistic perspective Bernard Mohan, Tammy Slater à Department of Language and Literacy Education, University of British Columbia, 2125 Main Mall, Vancouver, Canada V6T 1Z4 Abstract Using a functional view of language and drawing on extensive classroom data, this article examines a high school science class to see how language was used to connect theory and practice in science register. The article tracks the teaching/learning paths from the introduction to the science topic and teaching of the theory (e.g., technical terms) to problem-solving activities (the practice) that necessitate the use of the terms. Research implications include (1) the value of a functional perspective which looks at science learning as a social practice for both a sharper understanding of issues of science language and content integration and a greater ability to analyze the role of language in learning science and (2) the significance of the theory–practice contrast for student learning. Assessment implications include the research potential for greater understanding of the development of scientific discourse in science classes as well as richer conceptions of the linguistic connections between students’ practical experience and theoretical understanding of science. r 2006 Elsevier Ltd. All rights reserved. Keywords: Systemic functional linguistics; Social practice; Theory/practice relations; Science register; Language and content integration; English for academic purposes 1. Introduction The study of scientific discourse in school, like any other area of English for academic purposes, is based on the functional analysis of discourse in the contexts of academic study ARTICLE IN PRESS www.elsevier.com/locate/jeap 1475-1585/$ - see front matter r 2006 Elsevier Ltd. All rights reserved. doi:10.1016/j.jeap.2006.08.004 à Corresponding author. Tel.: +1 604 228 7817. E-mail addresses: bernard.mohan@ubc.ca (B. Mohan), tslater@interchange.ubc.ca (T. Slater).