Fiscal year 2001-2002 saw record numbers of inmates in Scotland's prisons, adding to the burden on existing facilities and highlighting the need for additional investment in expanded accommodation. The main area of inmate population growth has been in long-term adult prisoners, where increases approaching 15 percent have been experienced. A prison Estates Review was begun in 2001-2002 to determine what the prison system needs to fit it for the 21st century. Progress was made in the development of information systems that will accurately measure the success of interventions designed to change criminal behavior. Performance targets achieved for the year have included accreditation for a number of rehabilitation programs and improvement in inmate education and the number of learning hours delivered to inmates. The year saw an unprecedented reduction in the number of serious inmate-on-inmate assaults. The target for the number of serious assaults on staff was bettered, continuing the positive trend of the last 5 years. Although improved security and treatment measures have targeted drug abuse in prison, the SPS did not reach its performance target of 85 percent inmate drug abstinence; 83 percent was the actual achievement. The average cost per inmate was well within the target range. A chart shows the SPS performance against key ministerial targets. Appended data on the prison population, prison programs, staffing, and training