In Spain , middle school roughly corresponds to the four-year Educación Secundaria Obligatoria or Compulsory Secondary Education (ESO), from age 12 to 16 (or 11 to 15, depending on the birth date). It is divided in two cycles of three and one year with its own grading, from 1st to 4th of ESO. The second cycle (4th of ESO) contains two options: one geared towards the Spanish Baccalaureate (equivalent to high school), which is similar to the 1st year of high school in other countries, and the other towards vocational training.  
Each country will have a different education system and priorities.  Schools need to accommodate students, staff, storage, mechanical and electrical systems, storage, support staff, ancillary staff and administration. The number of rooms required can be determined from the predicted roll of the school and the area needed. A general classroom for 30 students needs to be 55 m², or more generously 62 m². A general art room for 30 students needs to be 83 m², but 104 m² for 3D textile work. A drama studio or a specialist science laboratory for 30 needs to be 90 m². Examples are given on how this can be configured for a 1,200 place secondary (practical specialism).,  and 1,850 place secondary school.