🚀 go-pugleaf

	Regarding your question on multiple grades:  One reason why an 
attempt is being made to group students together of more than one "grade" 
is to allow for different rates of growth in various realms of life such as 
social, physical, psychological, emotional and intellectual.  As we know, 
children mature in these areas at different rates and therefore, in our 
present educational systmem (where students are grouped almost solely on 
the basis on their chronological age) we do not allow for more than a 
year's difference in the various domains previously mentionned.  So rather 
than grouping entirely according to age, there is more of a chance to group 
students according to various abilities together. (since there would likely 
be up to a three year spread between those in the same grade)   This would 
therefore allow for students to progress at different levels.  One scenario 
might be as follows:

Student A is gifted at Math, somewhat at Art, but not at Physical sports.  
Therefore, he might be with those students who are more ahead at Math; 
switching to a group less adept at Art time; and then going with a 
different group who find Physical sports more difficult and demanding.
This type of system can be more easily accomplished if a class encompasses 
students across two or three grade levels because various in learing rates 
for different individuals and different subject areas.