This article examines the highly specific problems of roof support in coal mines to construct a theoretical framework that describes how texts represent information that is embodied, sensory, and uncertain. As this analysis suggests, workers in risky environments may follow instructions and still fail as situations change. Engineering and management approaches also may fail unless they reflect the kinds of embodied sensory information decision makers need to assess risk in local contexts. This analysis then raises ethical questions about (a) textbook notions of instructions as systematic procedures designed to produce predictable outcomes, (b) limits of particular types of information as signs or indexes of risk, (c) the role of generalized knowledge in uncertain environments, (d) the role of texts in representing knowledge that is sensory and uncertain, and (e) the locus of responsibility for safety if knowledge exists outside of written texts.

Despite the fact that technical writers try to maintain an objective outlook, they cannot ignore the psychological states of consciousness that influence their writing. Arthur J. Deikman's theory of bimodal consciousness outlines two psychological states: active and emotive (or receptive). Writers must maintain a balance between the receptive state and the active, striving state to prevent writer's block and to enhance creativity, just as scientists balance mathematical (i.e., lexical or verbal) thinking with physics-related thinking. This article describes Deikman's model and shows its application in the technical writing classroom.