•   Human performance exceeds machine    performance by a factor ranging from    4x to 10x depending on the task. •   On some tasks, such as credit card     number recognition, machine     performance exceeds humans due     to human memory retrieval capacity. •   The nature of the noise is as important     as the SNR (e.g., cellular phones). •   A primary failure mode for humans is    inattention. •   A second major failure mode is the lack    of familiarity with the domain (i.e.,    business terms and corporation names).