I am not an experienced chicken keeper but wanted to post my process because I haven't seen anything exactly like what I have done. Mostly, I have taken a lot of time in each phase of the process. I have an flock of 5 Buff Orpingtons who are about 2 years old. I purchased 4 chicks to add to the flock. I started off leaving the little girls in their own nursery on the other side of the house from the main flock. This was the quarentine stage to check for disseases. I tried putting them in the coop for a couple of hours but a snake ate one of the chicks. I returned them to their coop covered in bird netting that seemed to foil the snakes. They came in at night. to the bathroon. This went on for about 8-10 weeks. Then I would take them out to then ewly reinforced coop and stay with them to let them get excersize each day and have exposure to the older girls. Again, it was no 1 week affair. I did this for about 3 weeks. They continued to come in at night. Finally I decided I couldn't keep bringing them indoors. I followed the advise of someone here and put the orange netting for building sites up and partitioned off part of the coop. This worked well but no one was getting along still. Things started speeding up after this. I let the little girls free range with the older girls all day. The area is large enough for them to get away from the big girls and there is lots of cover and safe places. Over a week or so the flocks seem to get into closer proximity to each other but still some chasing the little girls around. After sleeping in the coop, last night was the first night I put them in the sleeping box with the big girls. I waited until dark and put them in.I left one of the large front doors open which forced the big girls to one side of the small box which is about 4'X4' I went out first thing this morning to moderate. Things went well. Tonight is night 2. I am working towards the time when the young ones will go in through the electronic pop door and I can close up the front doors on the sleeping box. This will add a whole new level of protection. It has all taken far more time than I anticipated, but have decided I will go by their comfort levels and not someone elses opinion that everyone should get along and be happy in a week or two. I write this because I want to remember it if I am ever planning on getting more chicks. It's been a lot of work and maybe I am too proctective but they are worth it. I don't want any animal of mine to feel fear if I can avoid it.