Although the live show for the First Semi-Final takes place tomorrow evening, when viewers in 19 countries will have their opportunity to vote to decide the ten qualifiers. It is worth remembering that this evening's dress rehearsal is of equal significance, as this is the rehearsal that the professional juries will be watching and voting on, and they are responsible for 50% of the votes.

http://www.eurovision.tv/page/news?id=making_your_mind_up_time_for_the_juries