All this week we've been looking at the issue of bullying.
As part of that Hayley visited a school in Copenhagen, which has all kinds of rules to make sure that all the pupils get on with each other.
Here is Hayley's diary of what she saw:
"During my time at Newsround I have been to many schools around the UK but none have been quite like the Bernadotte School in Copenhagen, Denmark.
As soon as I walked into the playground I knew it was different.
At this school making friends and being a good friend is as important as learning to read and write. And there are rules on friendship, which are as important and as strict as doing your homework or wearing your uniform.
This school is not the only one in Denmark that puts friendship on the school programme, and there are some schools in the UK that teach respect and kindness in the classroom too. But there are all kinds of rules in place to make sure that everyone is treated well and respected.
- No one should have just one best friend. The children I spoke to told me that having a best friend means that all your happiness depends on one person Whereas if you have lots of friends, there will always be someone around to hang out with.
- No one has a particular chair or table to sit at - the kids must sit in a different place each day.
- The classes are also mixed up so that you are in a class with different people each week.
- You must not play a game that excludes others. This means that if you are playing a game that usually involves three people, like piggy in the middle or skipping, then you must change the rules to allow other people to play or you must play another game that includes everyone.
- You can never invite just two people home to your house for tea - you must invite everyone who might want to come.
- If you have a birthday party you must invite everyone in your class.
- You cannot give people birthday presents in school. Instead everyone in the class makes a picture for the birthday boy or girl and those pictures are put into a book for them.
- Every week, the people in your class go home for tea or go on an evening out together.
When I asked the kids what difference these rules made they all replied with the same answer "There is no bullying at this school." No one I spoke to had ever been bullied or had ever known of anyone getting bullied.
When I asked the head teacher if this was true, he said that for all the years he had been there he had never known of any bullying. Occasionally there were arguments or sometimes kids felt left out of games, but the problems were always sorted out very quickly and no one felt left out for long.
This sounded great to me. I would have loved to go to a school where there was no bullying and everyone was friends.
But there was one problem with it. Why were the children not allowed to have a best friend? I have a best friend and she makes me happy, she's great fun to hang out with and she supports me when times are good and when they are not so good. So I was worried these kids were missing out on that.
I spoke to Sophia about this and asked her if she felt she was missing out by not having a best friend.
"No", she told me, "We can have a best friend or a friend who we spend most of our time with, but we shouldn't only have a best friend", she added.
She went on to explain: "This means means we must make sure we have other friends around us and never exclude them, because sometimes your best friend may not be around and it's better if you always have lots of people you're friends with."
I only spent one day at the school so I can't be sure that bullying never, ever happens, or that the friendship rules are always obeyed.
But seeing how the kids in Copenhagen treated each other it certainly made me think that having more friends, and trying to involve everyone in whatever you're doing, can't be a bad thing."