17 We compared the cost of BSF schools to those built under the previous programme of school PFI projects, Academies and One School Pathfinders. We used a regression analysis on data normalised for region and annual inflation using indices from the Building Cost Information Service. We obtained data on the cost of construction, ICT and facilities maintenance from PfS's benchmarking system and information collected by the Department specifically for our study. Where the construction cost of BSF schools was not included in the benchmarking system, PfS supplied data as given in the Local Authorities' final business case.