Terms that indicate "pay attention, we're getting ready to change"

Bob - good point about the open-entry/open-exit available to e-learners. Some transitional phrases may not make sense. That's actually an e-learning development challenge - how to avoid repetition for those who go straight through while accomodating those who hop around. Most courses we develop are set up to run sequentially, but we're trying to make them more interactive by letting the learner go where he/she wants.