this is discussed in more detail below this has considerable budgetary implications as the increases in student numbers trigger additional state transfers to schools for this reason it is being applied progressively over a fiveyear period with earlier implementation in deprived areas in the first year the increase in compulsory education became operational in municipalities and countrywide implementation is scheduled for the school year full implementation is aimed for in the school year and will imply that at least for the first two grades the average class size will be at or below the norm in oecd countries since the school year a socioeconomic index has been used to determine some of the budget allocation for primary schools