I had breakfast with my friend Brett this weekend. He's an accomplished musician and teacher. We were talking about ineffective teaching. He brought up a phrase which really stuck with me - "incidental language". Google this phrase and you get some discussion about not using slang with language learners. I also searched for "inconsequential language", which I kept saying in error at breakfast, and seemed a misnomer. Incidental language is incredibly consequential, and has a lot of depth.
In surgery, I give short, very direct, and highly specific instructions. "Cut somewhere on the hand" would result in, at best - a longer, inefficient incision; at worst - malpractice. "Incise the skin full thickness with a 15 blade longitudinally over the 4th metacarpal shaft" gives detail with no extraneous language. When teaching marching band, I do my best to instruct in the same way. Fluffy, over-detailed instruction leaves room for error. Also, pontificating often loses an audience, especially when numerous repetitions are planned. I think of the students, whether growing surgeons or high schoolers, as computers ready for a program. Simple, logical, instruction with clear code leads to (usually!) predictable results.
I'm not formally educated in teaching, so would love to hear comments about this from the many professionals out there!!