Dr Warburg
I believe that Dr Warburg needed to, first of all, embrace the process as it was meant to iron out any issue and enable the process to be as smooth as possible. The things Dr Warburg felt that they are not done in the right manner, she could have explained herself, especially on the teaching style of some of the teachers. That is the teaching is supposed to have explicit instruction and expectations. Depending on the level of education, Dr Warburg should have understood this and allow the teachers to carry out their work. In those occasions, when she was not happy, she should have communicated through the right channel rather than confronting the teachers.
The major challenge Dr Warburg faced was that the style of teaching was not she expected since clear and vivid instruction would have helped her son understood more. The other challenge was communication since she was unable to have a better avenue to communicate with the teachers, and she resulted in a confrontation.