On an average we remember:
10% of what we read
20% of what we hear
30% of what we see
So it comes out to average of 70% of what we read hear and see in totality. In our computer based tutorials it's a concoction of all this for better retention of knowledge.
Virtual learning through CBT or e learning is a combination of factual knowledge, our individual approach including psychomotor skills. CBT's can