In these studies, we examined the role of elaborations for subjects learning a procedural skill (viz., using a personal computer) from an instructional text. In Experiment 1, we compared two sources of elaborations: those provided by the author and those generated by learners while reading. In the latter condition, subjects were given advance information about the tasks they were to perform so that they would generate more specific task-related elaborations while reading. Each source of elaborations facilitated skill performance. This result contrasts with results of the past experiments testing declarative knowledge in which author-provided elaborations were found to hurt performance. In Experiment 2, the author-provided elaborations were classified into those illustrating the syntax of the operating system commands and those explaining basic concepts and their applicability. Syntax elaborations produced significant facilitation for experienced and novice computer users. Concept elaborations produced no reliable improvement.An important question to both memory theorists and pedagogists is, "What variables will improve the learning and retention of written information?" One such variable that has been the topic of considerable speculation and research is the effect of elaborations (J. R. Anderson & Reder, 1979;Bransford, 1979;Chiesi, Spilich, & Voss, 1979;Craik & Tulving, 1975;Mandl & Ballstaedt, 1981;Mandl, Schnotz, & Tergan, 1984;Reder, 1976Reder, , 1979Weinstein, 1978). In the view of most researchers, there are several reasons why elaborations should help subjects learn and remember the main ideas of a text. Elaborations provide multiple retrieval routes to the essential information by creating more connections to the learner's prior knowledge. If one set of connections is forgotten, it may be possible to retrieve the desired information another way. Furthermore, if the learner forgets an important point, it may be possible to reconstruct it from the information that is still available.Elaborations can arise from two distinct sources: first, the text itself can contain elaborations of the main ideas, and second, the reader can generate them independently while reading. We use the same term for both types, because we define elaborations as any information that supports, clarifies, or further specifies the main points of a text. Elaborations can take many forms, including examples, details, analogies, restatements, and deductions.