Which of the following is the best model to use to document the inputs to and outputs from a system?

The best model to use to document the inputs to and outputs from a system is a Data Flow Diagram (DFD).

Here are the steps to create a Data Flow Diagram:

1. Identify the system: Determine the boundaries of the system that you are going to analyze. This could be a process, a department, or an entire organization.

2. Identify the inputs and outputs: Determine what data or information is entering the system (inputs) and what data or information is leaving the system (outputs).

3. Identify the processes: Determine what processes or activities are being performed within the system. These processes transform the inputs into outputs.

4. Draw the diagram: Use circles or ovals to represent the processes, arrows to represent the data flows (inputs and outputs), and rectangles to represent the external entities that interact with the system.

5. Label everything: Make sure to label all the processes, data flows, and external entities. This will make it easier for others to understand your diagram.

6. Review and revise: Check your diagram for accuracy and completeness. Make any necessary revisions.

Remember, the goal of a DFD is to provide a clear and concise representation of the system. It should be easy for anyone to understand, even if they are not familiar with the system.