Detecting Irreducibility

Now that we understand why ID is fundamentally different than the theory of natural selection we can go about trying to test it appropriately.  My first step will  be to design an experiment that will test a simpler version of the theory.  Since the general theory says that a human can look at an artifact and detect an intelligent designer, the first experiment is going to be:
1) look at stimulus A
2) decide if stimulus A was designed by an intelligent being

This seems like a very basic experiment, but there are several things we need to consider before we get started.  First, a popular version of ID states that an intelligent being can be inferred when a human perceives something called irreducible complexity.  The current experiment skips to the chase and asks whether the human can detect an intelligent creator instead.  Why?  What we are really interested in is the detection of an intelligent designer and that is pretty easy to describe to novice experimental subjects.  If I have to explain "irreducible complexity" to someone before they can participate in an experiment it going to take way too long to get started.  Once we determine how people do at this task we will want to investigate to theories of how someone can do it.  Second, we will start with a set of stimuli where there are clear right and wrong answers which we can use to judge people's success.  This is much more complicated than it sounds, but we will talk more about it.  Finally, if we are asking people to judge whether something was designed I think it only makes sense to let them know what it was designed for.  After all, a knife has an intelligent design for cutting, but it doesn't have an intelligent design for carrying.  In the first experiment, we will assume that every artifact should be used to accomplish a task.  The question is: was this artifact intelligently designed to accomplish this task?