I would like to add:
(AG_Q1) How are the flow objects quantified/ Which units of measure are used?
(e.g. in monetary units, weight, etc)
(AG_Q2) Does the input and output of flow objects follow mass balance?
(e.g. iron ore and coal input used to produce steel, blast furnace gas, carbon dioxide)
(AG_Q3) Is output flow required for activity of type 'stock'?
(e.g. output of a landfill)
comment- power plant would be an agent, electricity generation is activity, electricity is the flow object.