International standards stipulate that imprisonment should not be limited to the deprivation of liberty. Rather, it should include opportunities for prisoners to obtain the knowledge and skills that can assist them in their successful reintegration upon release, with a view to avoiding future offending. The United Nations Standard Minimum Rules for the Treatment of Prisoners (the Nelson Mandela Rules) call for the provision of rehabilitation programmes in prisons that foster the willingness and ability of prisoners to lead law-abiding lives upon release. As the guardian of the Nelson Mandela Rules, UNODC has published a new handbook to provide a series of practical steps for prison administrators in order to assist them in developing high-quality and sustainable rehabilitation programmes that meet international standards and norms.