Today my grandson, a junior in high school, is getting a new teacher in statistics.  There are about 4 weeks left in the semester.  It is spring outside.  The new teacher is fresh out of college.  Oh Boy!  God bless her.  She will face her angst real fast.  I am thinking about what one gift I could offer her and the only thing I come up with is the Rule Of Three.  It goes like this:  Get to know each student's name real fast.  Then establish your rules and expectations (if you have any).  Let your students know what they are (less is better).  Make a practice of acknowledging when you see one of your expectations in practice:

1. Say the student's name.  2.  Complement the behavior specifically   3.Give the student something--a smile, a pat on the back, a star, a piece of candy.

     Be consistent.  Don't notice negative behavior overtly.  Catch the student being good.   Try it.  You can make it work.