Table 4. 5-scale rating used in the goodness rating test

Rating	Explanation
4	The pronunciation is perfect and completely native-like. The native judge cannot detect any foreign accent.
3	The pronunciation is correct but the native judge can still sense some slight foreign accents.
2	The pronunciation is correct but the native judge can detect obvious foreign accents.
1	The pronunciation is wrong but the native judge can still know what sound the speaker is trying to produce.
0	The pronunciation is totally wrong and it is not even understandable. The native judge cannot even decide what sound is actually produced.