Data Flow 2. Create a diagram illustrating data flow (see Chapter 5 figures for examples). It doesnt need to be complex at this point, just a breakdown of the system or systems youll be using to handle data. Where does external data enter the system? Where does it go and who will have access? Is internal data like employee information directed to one department or person? Why? Where will data be stored on a local server, the cloud, or something else?.