Carrots,
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"Yummy, don't agree.
Neighbours DDs go to local good comp with very active streaming.
They have to work very hard to stay in top stream, lots of very bright girls vying for their spots.
At their school it is very cool indeed to be studious. Those in bottom stream are referred to disparagingly as "chavs". So clearly not cool to be bottom!
If they have managed this then surely others can do it too."
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Your conclusion, sadly, does not follow from your premises.
The primary factors that contribute to the attitudes and ethos of the students in a school are yo do with home life and general upbringing, no anything that the school in particular does. The school can have some limited effects in building ambition, school community cohesion etc, or in tackling bullying better. But the cultures that result in brighter kids being taken down and bullied come from outside the school and are simply not within the school's total control.
I don't know where your neighbours kids live but this clearly has a lot to do with the different demographics of local areas. I'm sure there are plenty of excellent comprehensive schools in well off middle class areas where such issues are minor or non-existent. But there aren't many (or any) at rough council estates. Sadly all you are doing is replacing selection by 11+ with selection by postcode, and excluding the kids who create the problem by virtue of the fact that they can't afford to live where these great schools are. (Or they're not the right religion, but that's another story...)
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"I don't know why so many of you are so scared of their DCs attending the same school as those who are not as bright. It is not infectious! As long as good active streaming is used they will be taught with those of similar ability and it is possible to have a school filled with DCs with a positive attitude to learning."
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I can only speak for myself but I certainly don't have any problem about mixing with the less bright. It's the issues of attitude, culture and motivation that I have a problem with.
And actually, I think I agree with you that properly streamed comprehensive schools are probably the optimum balance, in abstract at least. But the fact is that many comps don't stream, so you don't get that capacity for the bright motivated kids to be among their own peer group in class. They're forced to be a minority spread among the cohort as a whole. If a family doesn't have access to the kind of school that does all this right as you are suggesting, then their best option for a bright child is probably a grammar, if it's available.
Arguments against grammars and for comprehensives often seem like this: they're based on how comprehensive education CAN work when all the circumstances are right and it's done best. That's all very well, but it's not the real choice that many people have.