IPO Models

input-process-output (IPO) chart. (1) diagram of a software system or module, consisting of a rectangle on the left listing inputs, a rectangle in the center listing processing steps, a rectangle on the right listing outputs, and arrows connecting inputs to processing steps and processing steps to outputs  See Also: block diagram, box diagram, bubble chart, flowchart, graph, structure chart. 

Retrieved from ISO/IEC/IEEE 24765:2017 Systems and software engineering-Vocabulary