Each observer participated in 6000 trials and in at least 30 practice trials beforehand, or until they were comfortable with performing the task.
The bloodshed in what until shortly beforehand had been China's capital still generates widespread bitterness in China.
He knew nothing about the plot to kill the Sikhs until immediately beforehand, as he stood in an orchard.
Planned months in advance, many participants hadn't been told they were expected to be there for the workshop until moments beforehand.
Organisers said the precise location of the camp would be kept secret until hours beforehand when activists receive texts and tweets instructing them to descend on the site.
Because of such threats, he said, Al-Fatiha has kept all details of its meetings secret until shortly beforehand, and has asked for and been given police protection in some cases.
Mr. Montesinos, the former aide said, was not tipped off about the Canal N broadcast until minutes beforehand, and then by an Argentine public relations adviser who had a contact at the station.
On paper it is a straightforward match for the world No 4, although he might not know until shortly beforehand if he is fit enough to carry on in the tournament.
Joey wasn't aware of the endorsement interview until days beforehand.
Paco Ortiz, the evening's singer, reaches into the dark recesses of flamenco pain in one song but obligingly explains beforehand that he will sing until the star finishes combing her hair backstage.
