If your cover letter fails to do its job, the whole process stops. You can only write a solid cover letter if you understand its purpose. Cover letters that only cover the basics don't give the reviewer any useful information.
Understand that you're actually doing the reader a favor by making a clear, strong case about yourself.
Most of the time, reading cover letters is a total waste of time for the person reviewing applications, because they don't actually say anything enlightening about the applicant—and as a result, they all sound the same.
In addition, he or she will have to make sure that the support staff is getting only good quality professional development.
Along with managing the senior high school, the principal has to supervise the assistant superintendents and superintendents that come under the school district.