Reading Foucault today the following passage struck me, although it was little to do with the reason I've been reading Foucault.
The organisation of serial space was one of the great technical mutations of elementary education. It made it possible to supersede the traditional system (a pupil working for a few minutes with the master, while the rest of the heterogeneous group group remained idle unattended). By assigning individual places it made possible the supervision of each individual and the simultaneous work of all.
(M. Foucault 1977, Discipline and Punish, London: Penguin p.147).
Every Saturday morning I take my son to his beginner swimming lessons. The approach taken by the swimming teachers at our local swimming pool is very different from the approach taken by my own swimming teacher at the same level. At my son's lessons the teacher is in the water and she spends a few minutes with each while the other groups members talk, splash each other or practice putting their faces in the water (the traditional method in Foucaultian terms). When I learnt to swim, the teacher did not come in the water at all. He stood at the side of pool giving instructions to the whole group then altogether, then we all did as as said (or at least tried). I never actually saw my swimming teacher swim-- he used the discipline approach.
I have no view on which approach might be better in terms of teaching someone to swim. Perhaps there is a debate in the swimming teaching community about which approach to group teaching is best. This post is pure observation and not an opinion!