Much of the responsibility for that lies in the fact that too few have ever been exposed to clear and consistent teaching on the subject. (faith.org.uk)
We recommend that trainees be 200 hr certified and have at least 6 months of consistent teaching experience. (beyondbrycett.com)
On top of that, her resume showed ample, consistent teaching experience: most notably, four years employment at the same school. (theladders.com)