can we say this ?
he or she is a good coach when this equation is completed:
coach = right material + achievement
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ABSOLUTLY NOT!
The equation only work the other way around:
Achievement = right material + (a compentence) COACH + (a billion other factors e.g. familly matters etc.)
I would be more impressed if a coach can get something out of a initial bad player (BTW how to measure right/bad material???).
Concerning achievement, it should be relative, so I rather define it in relation to improvements, if at all it is relevant.
Don't forget, is the question about just defining a coach/trainer in general, or specific for badminton and do we only try to define the good coaches/trainers or both good and bad?
Once I had two classes, where I pratizied very different teaching methods. For the first class I experimented a lot, and for this class the meeting protocool (what do u call it in english?) for the students became very low. For the second class their meeting was relative more steady!
Theese classes played on a low level and just wanted to have fun, hence tournement achievement was not the most important!
So can U conclude that for the first class I performed bad, and for the second class I was relative good?
One of U mentioned the relationship between teacher and student, which is a very interesting point! I mean no matter how good the teacher is concerning badminton, the teacher is not in control of factors like chemistry! So maybee it is also about finding a match!
(BTW: this is late, plz u r welcome to correct my english, as I want to learn).
Merry Christmas