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Each member of a carefully selected audience firstly fills out a questionnaire, used to describe the composition of the audience, and then each member has a dial, to which they select their feelings towards the vision or stimuli. This dial is checked centrally every three seconds, and as the audience reacts differently over time, the collective feelings of the audience are gathered.
In Australia, the worm has been almost a traditional part of televised political debates (though its use is not solely restricted as such), and had screened the worm graph as the politician spoke, though the politician could not see this graph. However, John Howard has recently asked the televisor Channel Nine, of the most recent "Great Debate" (for the 2004 federal election), not to screen the worm whilst either politician spoke, but however the worm was involved in post debate analysis.