The necessity to establish a range of pedagogically sound delivery guidelines for the development of multimodal learning environments is proposed in this paper. To support this discussion a summary of findings from four research projects investigating three multimodal learning environments delivered at the University of Southern Queensland is used. These findings were also used to help refine a set of 15 multimodal design heuristics (or rules of thumb) to be considered when designing multimedia enhancements for learning environments. In proposing these heuristics, this paper attempts to contextualise the importance of multimodal delivery and considers how catering for a multiliterate clientele, by using a combination of multimedia enhancements, may improve the learning opportunities of students. The studies described in this paper also demonstrate that higher levels of student engagement are possible when using a range of multimedia enhancements in learning environments, whilst also maintaining a balance for more traditional learners.