Ladies,
I have been pondering this thread quite a bit, and I see three possible options for those who have an 8th grader just finishing Rev2Rev and are weighing whether to go into MTMM as a 9th grader or to move into the new World Geography guide.
Before I list the options, I will mention that as I'm having my second son (who is an 8th grader) go through MTMM this year I am so glad he has had this tour through later American history the way it is written in MTMM. It is such a different experience than my own oldest son had when he just used SOTW along with living books through Ambleside for this time period.
I can admit that in comparison my older son's approach did not have the faith-based richness and coordination of American history with world history that MTMM has. Students who skip MTMM will miss the experience of reading story after story of how Christians dealt with events in history that would shake the faith of most people today (and it is a different experience reading these stories interwoven with the context of the flow of the history of that time, rather than just reading through the stories at random).
MTMM also provides an important deeper look at the very volatile time period of World Wars and continuing unrest in recent history; and it does it by integrating world history and American history, while sharing stories of people of faith who lived during those times. This integration provides a much fuller picture than can be gained when studying any of these types of history in isolation.
Things like the Depression and the Holocaust are handled on a much deeper level in MTMM than they will be able to be handled in a one-year sweep of World History in High School.
For these reasons, I believe that MTMM is an important guide in deepening a child's faith and in understanding that God is sovereign even in times of terrible trial and tribulation. This is why I hesitate to have kiddos move past MTMM and into the high school guides too quickly. Simply reading the resources from MTMM will in no way duplicate the year of learning and wrestling with hard faith issues that comes from using the guide as written. This is because MTMM goes way beyond a book list for students to read through. It is written for students to grapple with and think deeply about, and I pray that it will make their faith more unshakeable by providing examples of Christians from the past who responded to sin's terrible consequences in a way that is pleasing to our Lord and Savior.
With this in mind, one possible option would be to continue on into MTMM and to borrow part of the right side of the World Geography guide (for science mainly). In this scenario, you would go through MTMM mainly as written, except for the science. You would use DITHR along with higher level books, WWTB Vol. II, and Rod and Staff as scheduled in MTMM to earn a credit of literature. This option will work well for students who fit better in this guide for language arts and for whom the jump up to the World Geography guide's level of literature study, composition, and grammar would be too much of a jump. It will also work well for students who need a gentler step up in Bible, as Bible is fine for a 1/2 credit as written in MTMM but not as rigorous as the Bible in the World Geography guide. You could also add more to the Economics to earn a 1/2 credit in MTMM, and add the foreign language from the World Geography guide (or in any way you choose) for a 1/2 credit. Then, the following year, you would head into the World Geography guide, using everything in that guide as written, except the science and possibly the foreign language as a 10th grader.
This path provides more of a stepping stone in language arts and Bible, and waits a year to add more coursework like Logic and World Religions (and possibly even waiting on foreign language), thus shortening the child's day significantly when compared with the World Geography guide's pacing.
This schedule will also work well for those who are struggling or are a bit behind in math, as we don't want to overwhelm the child who is needing to work hard on the 3R's by adding to many additional weighty subjects too soon.
If this scenario does not seem to fit your child, then a second possible option would be to continue on into MTMM for the left side only and use the right side only of the World Geography guide for the 3R's, Science, Bible, and Logic. In essence, you would have your child do the left side of the guide as written from MTMM and add the right side of the World Geography guide as written for the other subjects. This would be a pattern you could then follow the remaining years of high school. In this scenario, you would also add something more to earn the Economics semester credit, as your child would miss that subject by missing the final high school guide.
This scenario would work well for a child who is ready for more rigor in literature study, composition, grammar, math, and Bible than what is found within MTMM. It would add an additional course of Logic and add a higher level of science. However, it would allow the child to wait on adding other electives (like World Religions and foreign language) and keep the history more manageable in its requirements (making sure the child doesn't jump too far forward too fast), so as not to overwhelm a child. In essence it would allow a child ready for a bit more to move forward in some subjects without the jump being huge in all subjects. Of course, you wouldn't have to use the entire right side of the World Geography guide (if you desired a different combination in the 3R's, Science, Bible, or Logic), however I share this option because it is a very clean and easy option to do...Left side of one guide and right side of the other. It would also result in earning all needed credits for graduation without a lot of tweaking and modifying each year and make a fairly straight path through high school accessible, balancing weight of content in a bit of a middle ground approach.
If this option does not seem to fit your child, then a third possible scenario would be to move past MTMM and just do the Geography guide as written for 9th grade. As a parent, I can definitely see the appeal of this option, yet I wouldn't do it with my own child without quite a bit of prayer and thought. Some students will handle this jump just fine and others may struggle with the jump from Rev2Rev to the World Geography guide. This is why there is not a one-size fits all answer to this scenario. Instead, each family must seek what is right for his/her student, and each student is different!
Students would need to be ready to move onto a much higher level of literature study, composition, grammar, Bible, science (with higher more rigorous labs), and three extra electives of coursework (like Logic, World Religions, and foreign language). They will need to have the math required to pursue a higher level of science with lab calculations, and be ready to spend more hours doing school each day. Students will need to be good time managers and have good accountability when working independently. They need to be able to write easily and read very well, as the number of pages and number of readings really jumps up. They will need to be able to get their thoughts on paper in lucid form quite easily and be able to edit their own work readily. If this doesn't describe your student, then one of the other two options that I shared will be a better choice.
The option that fits best for one student may not be the best option for another. I want to be sure as I give any advice that I remember to look at each child as an individual, rather than giving a "pat" answer based on age level. This is because so much more must be considered in this decision than age, and without knowing more about each child as an individual I can't begin to give advice as to which scenario would be best.
This is why I think this type of decision must be a dialogue, with the final decision varying from family to family.
Blessings,
Carrie