My kids are 7, 5, and 3, so I only have a few years to look back on so far, but here’s what I have right now.
I’ve started a master booklist to keep track of the books that we’ve used and I know we’ll want to use again. I just made a table with 5 columns – the title, where the book is (ie. ebook, library book, hardcopy on the shelf) and then a column for each kid. I date when each child listened to/read the book. My kids are all 2 years apart, so I can easily see that if we read something 2 years ago, it might be time to revisit it with the next child. I have a few notes next to the books to remind me if the book turned out to be a bit advanced for DD7, so I’ll know to wait a bit for the younger kids. I also put books on the list that I want to read in the future, so as we finish something, I know what my next choices are.
For another example, right now DS5 is learning to print, so I’m glad I filed all of DD7’s printing practice and early copywork that I designed, so I don’t have to re-invent the wheel. We started with copying family members names, days of the week, months of the year, simple phrases, etc., so I just make a new blank sheet for DS5, and off we go.
With some other things, I can look back at my ‘term plans’ to see what we did in any given area and decide whether I want to repeat it with the next child. (I keep notes of what worked/didn’t work) As the middle child, DS5 will probably get things twice in some areas, once as a tag-along with DD7 and once again when DD3 is ready. I may not do everything 3 times (such as a book of poetry that we did together). I supposed it would depend on your children and spacing.
Joanne