First, in 1961 Felix Kaufman wrote Electronic Data Processing and Auditing. The book compares auditing around and through the computer. Historically, auditing around the computer entails traditional manual procedures in which the existence of automated equipment is ignored. As such, the computer is treated as a black box. In this context, auditors rely upon physical inputs to and outputs from automated devices and do not concern themselves with how processing actually occurs within the system(s). Conversely, auditing through the computer involves actual use of computer systems in testing both controls and transactions. Finally, auditing with the computer entails direct evaluation of computer software, hardware, and processes. Consequently, auditing through the computer or with the computer is able to provide a much higher level of assurance when contrasted with auditing around the computer.