Rehabilitation is the process of re-educating and preparing those who have committed a crime, to re-enter society. The goal is to address all of the underlying root causes of crime in order to ensure inmates will be able to live a crime-free lifestyle once they are released from prison. It generally involves psychological approaches which target the cognitive distortions associated with specific kinds of crime committed by individual offenders, but it may also entail more general education like reading skills and career training. The goal is to re-integrate offenders back into society. A successful rehabilitation of a prisoner is also helped if convicted persons: are not placed in health-threateningly bad conditions, enjoy access to medical care and are protected from other forms of serious ill-treatment, are able to maintain ties to the outside world, learn new skills to assist them with working life on the outside, enjoy clear and detailed statutory regulations clarifying the safeguards applicable and governing the use and disposal of any record of data relating to criminal matters. See also prisoners' rights. Incarceration in Norway Norway's prison system is based on the principle of normalization and away from retribution to focus on rehabilitation. Inmates have access to amenities they would have outside of prison, such as an exclusive mini fridge, flat-screen TV, private bathroom, and access to outdoor environment. This, along with a shared kitchen and living area "to create a sense of family" among inmates and the absence of traditional prison uniforms contributes to Norway's rehabilitative normalcy system. The prison's structure is composed of Units A, B and C, with Unit A housing those in need of psychiatric or medical attention, thus being the most prohibitive of the three. Halden fengsel, referred to as the "world's most humane maximum-security prison", embodies the country's goal of reintegration by aiding inmates in sorting out housing and employment before leaving the prison.