The most memorable morning session at the Singularity Summit 2007 was the inimitable Eliezer Yudkowsky’s. He talked about three different schools of thought about the Singularity: Vingean - where prediction becomes impossible Accelerationist - exponential technological change Greater than Human Inteligence - in a positive feedback loop His thesis was that the three schools reinforce but also contradict each-other. Another good point Eliezer makes is that advances in scientific knowledge and algorithms reduce the threshold for the Singularity.