"By facilitating cross-jurisdictional comparisons of the rules and practices that surround administrative segregation, this Report both reflects and supports ongoing efforts to understand its impact, reevaluate its use, and limit or end extended isolation ... Calls for significant reductions in the use of isolation come from all quarters and, importantly, from the chief operating officers of prison systems. But without a baseline, it is not possible to know the impact of the many efforts underway to reduce or eliminate the isolation of prisoners and to enable prisoners and staff to live and work in safe environments, respectful of human dignity. Time-in-Cell provides one measure, to use as a baseline to assess whether the changes hoped for are taking place, such that the number of persons held in such settings and the degrees of their isolation are substantially diminishing" (p. iii). This report is divided into eight sections: the parameters and concerns about administrative segregation; the 2014 Limon-ASCA Survey; the use of administrative segregation; the demographics of administrative segregation-2011, 2014; living in administrative segregation-degrees of isolation; the administration of ad seg; reconsidering administrative segregation; and revising the use of administrative segregation-lessening the numbers in and the degrees of isolation.