The Manchester Arena Inquiry will investigate the deaths of the 22 victims of the terrorist attack at the venue in 2017.
Here, Sky News looks at what we can expect.
Each bereaved family will be given the opportunity to talk about their loved one.
The inquiry will hear evidence about each of the victims' movements around the arena on the night of 22 May 2017, and their cause of death.
The trial focused on the way the brothers collaborated to build and detonate the bomb.
The inquiry will be wider and examine four key questions: whether the atrocity could have been prevented by the authorities, the build-up to the attack, the security arrangements at the arena, and the emergency response to the bombing.
The inquiry will hear evidence from MI5, police, ambulance and fire services, those involved in the security of the arena, and bereaved families and survivors.
Many of the survivors will give their accounts of what they saw of the explosion and the appalling aftermath in the foyer of the arena.
Sir John Saunders, a retired High Court judge, will chair the independent public inquiry.
The possible failings