"Following his arrest, Boy Y was diagnosed with autism spectrum disorder, which affected his communication skills.
His speech during five interviews with police, after he was held on suspicion of murder, was barely audible in court and was indecipherable without the assistance of a transcript.
In pre-trial hearings, there were questions over whether Boy Y was fit to stand trial, given his difficulties.
But ultimately he was deemed to be fit, and the court employed extraordinary techniques to allow him to give evidence.
In court, both defendants were assigned an intermediary, who sat with them through the whole four week trial.
Intermediaries are communication specialists who help people give evidence at court.
Sometimes, they would interject to inform the judge that there was an issue with one of the defendants -
if they felt tired and if they believed a break was needed or whether an early finish to court proceedings was necessary.
Both defendants were allowed to follow some of the proceedings via video link from the secure units where they were being held.
When on video link, both defendants could be seen playing with toys which were said to assist with anxiety.
Boy Y was even seen with a crossword puzzle on one occasion.
Perhaps controversially,
he was allowed to remain outside of court while Girl X and Brianna’s loved ones listened to gruesome evidence from a pathologist about the catalogue of injuries which caused her death.
Throughout the trial, Boy Y's lawyers raised concerns that he hadn’t been eating or drinking properly.
And at one stage, given the extraordinary allowances made for Girl X and Boy Y throughout the trial,
the judge, Mrs Justice Yip, reassured Brianna’s loved ones listening on in court that their interests were at the forefront of her mind.
On the first day of the trial,
Girl X was said to be 'visibly shaking'.
'I don't find that highly unusual', the judge said in court in the absence of the jury.
'That's something people do when they are nervous'.
When she gave evidence in court from behind a curtain in the witness box,
Girl X was seen to have a visible facial twitch as she fidgeted with a multi-coloured toy."
Girl X and Boy Y will be sentenced on February 2
www.manchestereveningnews.co.uk