The state of prisons in England and Wales
Prisoner numbers, prison staff numbers and levels of violence in English and Welsh jails.
Is the number of frontline prison officers going up or down?
The number of frontline prison officers is falling and has been since 2010, although there were increases in recruitment last year.
The rising prison population
The prison population was about 45,000 in England and Wales in 1990 and 1991 and is now about 86,000.
Does re-offending cost £13 billion a year?
That's the upper range of an estimate for 2007/08.
Self-harm and suicides in jail
We check the Prime Minister's figures on self-inflicted deaths and injuries in prison.
How many prisoners re-offend within a year of release?
Close to half of all prisoners in England and Wales will commit another criminal offence within a year of being released.
Two prisoners to a cell designed for one: how many are living in overcrowded conditions?
Two prisoners occupy a cell intended for one. How many are living in 'crowded accommodation'? Some prisons have been counting only one prisoner.