All eyes will be on Anders Behring Breivik as he enters court to see if he makes his now familiar right-wing salute when his handcuffs are removed.
The families of his victims have complained about the clenched fist gesture the killer has made at the start of each day of his trial.
Breivik's legal team has spoken to him, and the families are hoping he will respect their wishes and refrain from doing so at the beginning of day four of proceedings.
The prosecution in the trial of the man who killed 77 people in Norway last summer is focusing on the first of his two attacks.
The court will be looking at the circumstances leading up to the bombing of a government building in the heart of the capital, Oslo.
Breivik admits attacking the offices of the Norwegian Labour Party, whose members he condemns for supporting multiculturalism.
He killed eight people there before travelling to Utoya island, where he shot and killed another 69 - most of them young Labour Party supporters.
The prosecution has spent hours testing his claims that he was working for a European anti-Islamic network.
He claimed on Wednesday that he had travelled to London in 2002 to co-found the Knights Templar - a militia tasked with stopping the spread of Islam.
In the manifesto he published to justify his extreme ideology, Breivik spoke of an "English mentor".
But when he was pressed to disclose the man's name and more details about the network he refused, saying he did not want anyone else to be arrested.
During what were at times testy exchanges in court, Breivik told the prosecution not to ridicule him.
He insisted that what he said about his London trip and a visit to Liberia to meet a Serbian militant was true.
He said Serbs in Kosovo were the inspiration for his attacks and that he admired their "crusader mentality".
Breivik admits to all of the killings, but pleads not guilty to terrorism on the grounds he acted in self-defence to stop the spread of Islam.
The five judges will have to decide if he is insane or criminally responsible. What they decide will dictate if he will spend the years ahead in a prison cell or on a psychiatric ward.