The teacher evaluation system evaluates teachers as: Highly Effective, Effective, Developing, Ineffective, Satisfactory or Unsatisfactory. A probationary teacher who receives two “Ineffective” ratings in a row will be presumed to be incompetent. Further, in order to achieve tenure, a person must be rated Effective or higher in 3 of the probationary period’s 4 years. A person who is not rated Effective or higher in at least 3 years can have their probation extended for a year.