One should recognize that rules and regulations vary from one class to another depending on several factors such as: general maturity level, academic qualities and the type of material being taught.
The main goal behind the idea of classroom management is to maintain an academic environment inside the classroom that would enable the student to receive a reputable and effective education; however, one should not oppress the students with these regulations especially in already loaded and pressuring materials (scientific and philosophies).
Because of student diversity, rules should be malleable enough to comprehend all types of student mentalities and behavioral issues. I don't Claim that I haven't changed my rules throughout the years, but at least not radically.
Teachers should be able to understand that rules are out to facilitate student learning and make their teaching as effective as possible. The aim of rules was never to make the students feel limited and oppressed by a dictator, represented by the teacher, but rather to give the chance to excel and go beyond thinking limits. Consequently, when the rules take into consideration all the above mentioned issues, they would remain throughout the profession even though the implementation could change, but not necessarily the gist of it.
Each class reflects a certain implementation of a particular plan. For example, a highly populated class requires more strict rules than another. The rules in the scientific classes are much more malleable than humanities classes generally because the material taught induces some specific concentration among the students.
The goals in a crowded classroom could be much stricter, due to the fact that if we try to breath altogether the class becomes noisy, how about if they do any other activity. Moreover, crowded classrooms are much more diverse and most of the time heterogeneous thus causing mush trouble to the teacher.
On the other hand a less crowded class would be more malleable and more apt to work, thus the teacher could introduce some fun and enthusiasm into the material taught.
The more the teacher knows the students, their problems, their reactions, the more he/she will change the management plans along with these factors.
The plans get loose along the year, they start taught and they either become leaner or tougher with time, depending on the class we're working with.
One of the most difficult aspects in inducing a plan that would be fair for all students equally. A hyperactive student or a shy one could not cope with a certain regulation. Consequently, could cause some unfairness in the attitude towards the issue.
Although most of the above answers reflect my teacher's attitudes and consequently mine, time and experience could show some misunderstanding and some very applicable and determine goals.
My personal opinion reflects that at the center of al this issue lies an integral and sophisticated core, called the student, who, and as I have researched in previous courses, is able to develop his/her personal educational philosophy. Al this sheds light on the leading role of the teacher in understanding these philosophies thus cope the classroom management philosophies relatively.