Sentencing reform has been the subject of much debate over the past two decades in North America, Europe and Australia. Among the concerns spurring this widespread reconsideration of sentencing principles and practices, there is the need to promote consistency in sentencing, the crisis in public confidence in the criminal justice system, and the constitutional argument for more legislative intervention in the area of sentencing. The reforms implemented in various jurisdictions to address these concerns have taken numerous forms: at the federal level in the United States, “base sentences” were assigned to each offense category, the final sentence being fixed in the light of the offender's prior criminal history and aggravating and mitigating circumstances; at the state level, several jurisdictions adopted a less detailed system of numerical guidelines, schematized by a two-dimensional grid of sentence ranges defined by classes of offenses and the offender's criminal record. Other jurisdictions, such as Canada, Britain and Sweden, eschewed the use of numerical guidelines as a vehicle to structure judicial discretion in favour of simpler statutory statements of principles in sentencing.