Mamas4bugs, I think that was helpful.

I was thinking the same thing. Even though he could probably do Preparing, Bigger might be the better choice to make his day a bit lighter since he doesn't seem to be enjoying school right now and his day is currently going long. Here is a link to the time that each program takes:
viewtopic.php?f=6&t=2093&st=0&sk=t&sd=a&start=135 It's on page 10. Hopefully that link will put you on page 10, but if doesn't just click over to page 10 and you can see the times that each program takes. Bigger takes about 2 1/2 to 3 hours and Preparing takes more like 3 1/2 to 4. Last year by the end of the year, Bigger was taking us about 2 1/2 hours. For us this year (we're on week 7), it's taking us right at 4 hours each day for Preparing. Only about 1/2 of that is my teaching time, but there are plenty of independent tasks to take my dc's day up to about 4 hours of solid effort.
Another thing to consider is the amount of independence involved in Preparing. Is your ds ready to start reading his science on his own, doing notebook pages, and experiments independently? Is he ready to start reading some of his own history, following directions to draw pictures and do copywork? We did Bigger last year when my twins were 8, and it was a great fit. Though I think they could have done Preparing, the amount of writing and the level of independence would have been a stretch for them.
You could go either way, but I would take into consideration the amount of writing, the amount of independent tasks, and how much time you feel he can devote to the program to figure out placement. I would make sure to do the math and grammar at his level no matter which guide you choose. If you do choose Bigger, I think you would be fine not to add the extensions. You could always use the extension books as read alouds for your storytime or as selections for him to read with DITHOR. I especially recommend Ben and Me, Guns for General Washington, Tolliver's Secret, and By the Great Horn Spoon. We used several of those as our read alouds for storytime and the other for DITHOR. They go along with the history period wonderfully and are excellent books.
I hope that doesn't confuse you more. I wanted to share some of my thoughts and experiences between Bigger and Preparing in the hopes of helping you understand them better. They are fresh in my mind since we just finished Bigger in May and we're in the thick of Preparing now. The placement chart is a great place to start when placing your dc though so don't discount that at all. I think your situation is a bit different than mine and most. I consider my 9 year olds as 4th grade now (and most of their friends their age are 4th also) and your ds is already finishing 4th grade at 8, so there might be a big difference in what he has covered. It sounds like you are ahead grade wise over there in Japan.

Even though he is ahead grade wise, usually motor skills and other maturity issues are more consistent with age so that might make a difference with where you want to place him since academics aren't the only things to consider. You'll know best where he fits. If you have any more specific questions about the differences between Bigger and Preparing feel free to ask. I'll try my best to help.
