An automated manual transmission includes first and second power input shafts, a drive gear part, a clutch arranged to transmit or interrupt the power of the engine to the first or second input shaft, first and second power output shafts to which power is transmitted from the first or second input shaft, driven gearing including a plurality of driven gears on the first and second output shafts, and a synchronizer connecting or disconnecting the first output shaft or the second output shaft and the driven gear to provide multi-stage gear shift steps. The clutch includes first and second clutches installed at the first and second input shafts to transmit or interrupt input engine power. An example of such transmission having 8 forward speeds and one reverse speed is described.