adc7d553__Island__SC___Comparison_Chart___Traditional_
[Montessori] Multi-age grouping is practiced so that students may learn “horizontally” from observation of other people’s work, directly or indirectly [“Traditional”] 
Students are grouped chronologically to suit teachers’ pre-planned class lessons
Montessori Education: Sea Pines Montessori Academy – Hilton Head Island, SC » Comparison Chart
“Traditional”