  The abstract concept of indeterministic free will is distinguished from the
phenomenon of free will. Evidence for the abstract concept is examined and
critically compared with various designs of automata. It is concluded that
there is no evidence to support the abstract concept of indeterministic free
will, it is inconceivable that a test could be constructed to distinguish an
indeterministic agent from a complicated automaton. Testing the free will of an
alien visitor is introduced to separate prejudices about who has free will from
objective experiments. The phenomenon of free will is modelled with a
deterministic decision making agent. The agent values independence and
satisfies a desire for independence by responding to challenges. When the agent
generates challenges internally it will establish a record of being able to do
otherwise. In principle a computer could be built with a free will property.
The model also explains false attributions of free will (superstitions).
