When presented with a procedure or concept to learn, imagining the procedure or concept may be an effective instructional technique compared to conventional studying, thus generating an imagination effect. However, it was hypothesized that the importance of learning through imagining as an instructional technique depends on modes of presentation. Experiment 1 tested adults studying or imagining contour maps as participants and was designed to verify the generality of the imagination effect. Imagination instructions were superior to study instructions on subsequent test questions. Experiment 2 further investigated the effect by comparing much younger students (Grade 4), studying or imagining temperature/time graphs presented in either a split-attention (spatially separated diagram and text) or an integrated (spatially combined diagram and text) format. Results on a subsequent test indicated that the Grade 4 students found imagining beneficial to their learning, compared with studying the material but the effect was only obtained using an integrated rather than a split-attention format. Experiment 3 was conducted to obtain verbal protocols from Grade 4 imagination and study groups using the same instructional materials to throw light on the cognitive mechanisms behind the imagination effect. ), resulting in the imagination effect. An imagining strategy is used when the learner reads the instructional material and then, either closes or averts his or her eyes and imagines the relevant procedure. To illustrate, if the instructions involve the steps in solving a problem such as 'Using the temperature/time graph, at what time was it 30 degrees?', the learner is instructed to read a worked example demonstrating the solution first, and then imagine completing these steps.There are theoretical grounds, discussed below, for hypothesizing that this imagination effect interacts with cognitive load phenomena such as the split-attention effect. Splitattention occurs when learners must split their attention between and mentally integrate disparate sources of information. For example, a diagram and spatially separated text, which refers to it, are better learned if the text is integrated into the diagram rather than presented adjacent to the diagram in split-attention format.