To require public schools to make teacher layoff decisions on the basis of whether a teacher is more or less “effective,” and prohibit using seniority as the primary or determining factor (“last in first out,” or LIFO). Also, to allow principals to refuse to accept an "ineffective" teacher assigned to the school, placing the employee on unpaid leave. The bill would establish an "effectiveness" evaluation system in which an empirical "student growth" standard would count for 50 percent of the rating. If a current union contract prohibits these criteria, they would only go into effect after it has expired.