Control pad used by audience panel
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Instant audience reaction to the three party leaders' performances in the prime ministerial debates is being gauged by BBC News using a specially selected panel of 36 undecided - or "floating" - voters. They are ordinary members of the public, recruited by polling experts Ipsos Mori on behalf of BBC News. The panel are split into three groups of 12, with each group assigned to concentrate on one party leader, watching the debate on TV screens. Each person is given an electronic voting pad, with keys numbers one to five so they can instantly register their reactions as follows: • 5 - very positive • 4 - positive • 3 - neutral • 2 - negative • 1 - very negative The result is an on-screen "worm" wriggling up and down - red for Gordon Brown, blue for David Cameron and yellow for Nick Clegg. When a leader speaks, the worm moving is the relevant group's reaction to that person. If there is no reaction - or a group's designated leader is not speaking - the line will stay flat. If the group likes what is being said, the line will go up, if they do not, it will go down. There is a small time lag before the worm moves as the panel participants react to what is being said.
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