…"But I'm as Good, once, as I ever was"
So sings Toby Keith, who has come to understand the difference between competence and performance. Years ago I owned a book by Marina K. Burt and Heidi Dulay written for teachers of English as a second language (ESL) in which they demonstrated that learners often do not perform to their level of competence. Learners make "goofs" not errors in this situation. Teachers and lecturers do the same.