Difficulty Scale--Classroom Lessons

***** Low 
(10%--25% of class requires some 
one-on-one instruction.)

***** Low Medium 

(30%--45% of class requires some 
one-on-one instruction.)

***** Medium 

(50%--55% of class requires some 
one-on-one instruction.)

***** High Medium  

(60%--75% of class requires some 
one-on-one instruction.)

***** High 

(80%--100% of class requires some 
one-on-one instruction.)