This thread is all well and good but, in some respects, some of it comes under the auspices of 'bee fiddling' in my book...
I'm a low impact beekeeper ... I do inspect, regularly, not as much as some on here recommend, but I know my bees, they are in the garden, I look at them daily - often several times a day and I get an almost sixth sense feel that I need to look in a colony. Perhaps it's just subtle differences that my subconscious notices or do the bees communicate with me on a level I don't appreciate ? It's surprising that when I open a colony up because I feel the need that I find something that needs attention ... but then open up others and it's business as usual ...
Anyway, I rather think that, sometimes, we spend too much time and effort tearing their home apart for no really good reason. Bees will swarm given the right conditions and giving space, at the right time, is often enough to reduce the swarming urge. I'm of the opinion that swarming can also be triggered by upsetting the colony equilibrium ... intensive inspections, searching for queens unecessarily, pulling every frame out of the brood box, keeping the hive open for long periods all disturb the natural order of a colony.
I'm sure that bees have become conditioned, over the millennia, to appreciate what is a good safe home for them and if they found a hole in a tree where a bear arrived every week to try and get at their honey - do you think they would stay there ?
My bees, this year, have made no attempts to swarm .. well, one colony made a few play cups then tore them down. There's a mixture of queens in the colonies, I've had a couple supercede and I guess I'm lucky - but, it's been a swarmy year down here and I'm the exception.
If you watch a beefarmer doing inspections .. they are quick, light and look only for essential information. We amateurs could do well to take a leaf out of their book.