A: EFT is derived from Thought Field Therapy (TFT), which was developed by clinical psychologist Roger Callahan, PhD. Both TFT and EFT combine tapping on acupoints with exposure (i.e, tapping while focusing on a physical pain or emotional upset). The techniques differ in that TFT uses elaborate diagnostic methods to determine which acupoints to tap and in which order while EFT simply taps on 13 or fewer points in any order and dispenses with the diagnostic part of TFT.