Efficiency challenges are also linked with the relative isolation of subsystems (pre-primary schools, basic schools, upper secondary schools, special needs schools) and the rather rigid boundaries between them. This makes it difficult for subsystems to share resources and also hinders the smooth shift of resources from one subsystem to another when needed and in function of demographic changes, emerging new needs, existing inefficiencies and changing policy priorities. This relative isolation of subsystems seems to be accompanied by the low intensity of communication between the administrative authorities responsible for these subsystems.