diffrence between ABC costing and the Time Driven ABC costing (HBR)

Explain what is different between the Traditional ABC costing (from text book) and the Time Driven ABC costing (HBR)
}Article: Time-Driven Activity-Based Costing. By: Kaplan, Robert S.; Anderson, Steven R.. Harvard Business Review, Nov2004, Vol. 82 Issue 11, p131-13