This paper describes a model for just-in-time (JIT) presentation of information. Learners receive the information needed to carry out a task precisely at the time it is needed. The model is twofold: supportive information is best presented before practising task clusters while prerequisite information is best presented during practice on learning tasks. JIT supportive information presentation promotes schema construction through meaningful learning or elaboration. JIT prerequisite information presentation promotes schema automation through proceduralization or restricted encoding while learning the recurrent aspects of a task. It leads to a reduction in extraneous cognitive load because temporal split attention is avoided. This frees up cognitive capacity for learning the non-recurrent aspects of a complex cognitive skill and so enhances transfer performance. An exploratory, empirical study is described that supports our model. Implications for teaching and teacher training are discussed.