I think you are over engineering it. The way I imagine it: Car {float throttle, float brake, float wheel} inherits PhysicalObject {velocity, mass, position} A

I think you are over engineering it. The way I imagine it: Car {float throttle, float brake, float wheel} inherits PhysicalObject {velocity, mass, position} Agent.accelerate(Car c){ c.throttle++; } Agent.drive(Car c){ ... accelerate(c); ... } Human inherits Agent