Solitary Confinement: Ken Strutin’s selected guide represents current research and thinking about the physical, psychological and legal implications of isolation as punishment, and the policy issues behind continuing this practice in the light of national and international standards and human rights declaration. Ken engages us to consider the ramifications of solitary confinement, the most extreme penalty in the hierarchy of incarcerative punishment. Depending on the institution, length of detention and purpose, this “prison within prison” has been described in many ways: administrative segregation, communications management unit, control unit, disciplinary housing unit, the hole, intensive management unit, lockdown, punitive isolation, segregation, SHU (special housing unit, special handling unit, segregated housing unit, security housing unit), and Supermax (Super-Maximum Security Confinement).