1.Start with one learner and one adult speaker neither of which have grammars.
2.Choose a meaning at random.
3.Get speaker to produce signal for that meaning (may need to “invent” random string).
4.Give meaning-signal pair to learner.
5.Repeat 2-4 one hundred and fifty times.
6.Delete speaker.
7.Make learner be the new speaker.
8.Introduce a new learner (with no initial grammar)
9.Repeat 2-8 thousands of times.