However, you are correct that some Principals and Assistant Principals do not conduct enough proper observations which leads to ineffective teachers continuing on in the profession or, at the very least, they do not receive the needed assistance to improve their classroom management. And to add onto this topic, the need for teachers is so high in some cities, that a lot of unqualified teachers are passed through to receive tenure (don't get me started on a lot of these Teaching Fellows programs). I will also mention that first year teachers do receive a qualified mentor teacher, so that is something that is currently implemented. Although some schools have a better support system than others.

In the end, teacher tenure and unions are absolutely necessary and vital components needed to protect our good teachers out there, especially due to the current teaching climate. The unfairness that goes on in the school systems would be downright shocking to most people. Tenure and unions help circumvent some of these situations from happening.