A special committee that has been studying potential changes to Boston’s school assignment system is expected to vote Monday night to recommend one of four proposals.

CURRENT SYSTEM

Three zones

About 24 schools per zone

Average travel distance: 1.87 miles

Annual transportation budget:

$88 million

THE FOUR PROPOSALS

1. Ten-zone proposal

Range of choices: 3 to 14

Average travel distance: 1.08 miles

*Preliminary annual cost savings: $1.4 million

2. Eleven-zone proposal

Range of choices: 3 to 9

Average travel distance:

Not available

*Preliminary annual cost savings: Not available

3. No-zone option A

Range of choices: 7 to 18

Average travel distance: 1.15 miles

*Preliminary annual cost savings: $2 million

4. No-zone Option B

Range of choices: 9 to 23

Average travel distance: 1.19 miles

*Preliminary annual cost savings: $256,000

*Cost savings are based on rough calculations that include only general education students and no grandfathering of students under current system.

SOURCE: Boston Public Schools