This book is Professor Givon's long-awaited critical examination of the fundamental theoretical and methodological underpinnings of the functionalist approach to grammar. It challenges functionalists to take their own medicine and establish non-circular empirical definitions of both 'function' and 'structure'. Ideological hand-waving, however fervent and right-thinking, is seldom an adequate substitute for analytic rigor and empirical responsibility. If the reductionist extremism of the structuralist schools is to be challenged on solid intellectual grounds, the challenge cannot itself be equally extreme in its reductionism.