While a user in the model, is whether producer or consumer, for example an executive or director, both having their own models, inheritance vs delegation, looks at employees vs Netflix as a producer vs consumer, or looking at the phone, consuming and producing a text, or on social media, where engagement model controls with the algorithms model, with AI, or testing models with company users, listening to producers all day and consuming what's necessary for the report model with algorithms deciding what to write, in engagement model.