School timetables, a badly framed debate

France stands out for a school year concentrated into fewer days than the European average, offset by longer days. That configuration is old and results from successive trade-offs. It is regularly noted in international comparisons, which relate the annual volume of teaching hours to the number of days over which it is spread.

The four-day week generalised in 2008, then the 2013 reform restoring an extra half-day, then the 2017 relaxation allowing a return to four days, have produced a situation where arrangements differ from one municipality to another.

Work on circadian variations in alertness is solid and long-standing: it describes troughs and peaks across the day, with differences by age.

What is not established is how to translate those observations into an optimal school organisation. Moving from a physiological fact to a timetable requires trade-offs chronobiology does not settle.

Nor is there any guarantee that variations measured on short, controlled tasks carry over unchanged to a classroom, where attention also depends on the subject, on the way the lesson is conducted and on the make-up of the group.

Phase delay in adolescence is well documented and has motivated experiments in delaying school start times, mainly in the United States. It refers to the tendency, observed around puberty, to fall asleep and wake up later, and it is found across varied cultural contexts.

Evaluations find an increase in sleep duration and more uncertain effects on school results. Objections bear on knock-on consequences, transport, activities, family organisation, which are the real obstacle.

Assessments of the 2013 reform bore mainly on implementation, on the organisation of after-school activities and their cost, rather than on learning measures.

No large-scale evaluation comparing pupil attainment by weekly arrangement has been published in France, which leaves the debate without national empirical arbitration. That absence does not mean the organisation of the week has no effect; it means the question has not been investigated with the tools that would allow it to be answered.

Arrangements are not randomly assigned: municipalities that chose one formula differ from others in resources and population, which forbids direct comparison. Only a variation imposed from outside, independent of local characteristics, would make it possible to isolate the specific effect of the arrangement chosen.

In addition, the question mixes distinct objectives, learning, fatigue, equal access to activities, the organisation of family and teacher work, which are not optimised by the same solution.