This systems distinguishes between consumptions and inputs.

    • Consumptions: are consumed in a flow and they can be infinite, like the sun light, or the wind.
    • Inputs: are consumed individually and can never be infinite. Inputs are the subparts that form a result.

For example: a process that mounts cars, takes the wheels, the chasis and the engine as inputs; and takes money and energy as consumptions.

Read the document about Inputs and Outputs for more information.