I didn't want to make a timeline and then run out of room in one time period and not enough in another, so I went with a more flexible system. I hung a piece of string across the school room, invested in a few packs of index cards and some paperclips. Whenever we wanted to add something, we would put a picture on the index cards and add whatever details we needed, like bio information, year it occurred, what they were famous for, etc. Then, I'd open a paperclip so that the inner hook was above the card and the outer hook would be taped to the back of the card. We could hook it over the string anywhere we wanted. As time periods got more filled, we would slide them over and make more room. I loved it. The kids really liked that we started with family members and they could see what happened when grandparents were kids or what happened after they were born.
We took it down when we changed rooms and it's still in a tub, but we'll get back to it next year

It was really cheap, really easy and worked really well
