SUMMARYStudents learned toy assembly sequences presented in picture, text, or one of three multimedia formats, and completed order verification, recall, and object assembly tasks. Experiment 1 compared repetitious (i.e. dual format presentations each conveying similar information) with complementary (i.e. dual format presentations each conveying different information) multimedia presentations. Repetitious presentations appear to provide learning benefits as a function of their inherent redundancy; complementary presentations provide benefits as a result of users actively integrating picture and text elements into a cohesive mental model. Experiment 2 compared repetitious with interleaved (i.e. assembly steps presented in alternating picture-text formats) multimedia presentations. Again, multimedia presentations led to overall learning advantages relative to single-format presentations, with an emphasis on both repetition and integrative working memory processes. Object assembly performance consistently demonstrated the utility of picture learning, with or without accompanying text. Results are considered relative to classic and contemporary learning theory, and inform educational design. Copyright # 2007 John Wiley & Sons, Ltd. Success in building an object or system, such as assembling a bicycle or computer network, is contingent upon well-designed instructions. Effective instructions help individuals learn about the elements of a procedure, as well as the connections and relationships between those elements; they are, in effect, lessons in how to perform a particular task (Zacks & Tversky, 2003). The present experiments examine the role of pictures and text in instructional presentations to gain insight into what presentation formats and organizations promote an understanding of how to successfully construct multi-step projects. In particular, we compare the effectiveness of different multimedia combinations (i.e. pictures with accompanying texts) to single-format (i.e. picture-or text-only) presentations on the comprehension and learning of procedures, and performance outcomes for completing assembly tasks.A growing body of evidence supports multimedia effectiveness for conveying both procedural instructions (Brunyé,