A The distinction between cases of writing and orality; the affective-motor axis; and the cognitive axis.
B The distinction between social and scientific knowledge; the intervention hypothesis; and the structural organization hypothesis.
C The superstructure hypothesis; the infrastructure hypothesis; the linguistic variation hypothesis; and the cultural approach.
D The distinction between acquisition and learning; the monitor hypothesis; the natural order hypothesis; the input hypothesis; and the affective filter hypothesis.
E The pure linguistic hypothesis; thematic neutrality; multimedia linguistic practice; and the atypical linguistic axis.