Process Flow – the flow of materials or documents that generates the Throughput of the system.

Information flow – contains all the relevant data that is flowing from the Process (Throughput) flow to the workforce and to the management the and gives indication about the progress or difficulties of the Process Flow.

Decision Flow – technical or managerial decisions that direct or intervene with the process flow.

Source: Oded Cohen and Jelena Fedurko, Theory of Constraints Fundamentals, 2012