Each position allocated to schools has a formula or criteria associated with the allocation. Some formulas are enrollment-based while others are program or needs-based. Each year, MCPS reviews the formulas to determine if adjustments are needed. Over time, MCPS has changed numerous formulas for staffing positions from enrollment-based to needs or program based. These positions include focus teachers, assistant school administrators, academic intervention teachers, alternative teachers, and focus paraeducators. There are other positions allocated based on programs. These programs include signature programs, immersion programs, magnet programs, ESOL programs, and special education programs.