When language is performed in ways that fit such expectations, it is culturally coherent. 4.0 Performance is fully culturally coherent, that is, would present no difficulty, discomfort, or puzzlement in interaction with a native. 3.5 Performance is superior, for the most part culturally coherent. There is little about it to create difficulties, discomfort, or puzzlement in interaction with a native. However, there is some aspect of the performance to make interaction less than maximally coherent for a native.
Most repair is self-managed.
2.5 Performance enables communication, but also presents several clear-cut sources of difficulty, discomfort, or puzzlement in communicating with a native. Repair is largely a matter of correcting problems, and correction comes mostly from others. 2.0 Performance creates definite obstacles to communication, which usually involve more than simple discomfort. Repair requires multiple, often repeated, correction and guidance from another. 1.5 Performance shows many problems that would create difficulties, discomfort, and puzzlement in communicating with a native.