Flanders system of interaction analysis categories (FIAC)
Observer uses a standard chart to record interactions at three-second intervals, placing each observation in one of ten pre-defined behaviour categories
Flanders (1970) found that in the typical American classroom, 68 per cent of the time is taken up by teacher talk, 20 per cent by pupil talk and 12 per cent lost in silence or confusion
The scale of the education system is vast, but most observational studies focus on a small number of pupils in just a single school
The limited scale of the typical observation study combined with the sheer size of the education system mean that observing school interaction is unlikely to produce representative data