Okay...this has brought up some interesting thoughts for me. Coincidentally my son & I have been figuring out how to "maximize" his efforts in the earning of his MB's. This actually started with two things.
1) Our troop noticed there is some overlap with the Safety & Emergency Preparedness MB's...hence they all earned both....Ventures & Scouts. (There was specific nights dedicated to Safety...but after nearly two months on Emerg. Prep....this was not so bad.)
2) I bought the "2011 Boy Scout Requirements" for a quick reference & stated actually reading all the requirements for all the MB's. (I know...kinda sick.

) As I have been doing so I have been noticing quite a bit of overlap from one MB to another in regards to requirements.
Another example of
"overlap", is for the Reading MB my son is working on. It shares some of the requirements with American Heritage...read a biography (historical). We talked about this being a good time to maybe open work on that MB as well.
Another "
overlap" was between Communications & Citizenship in the Community MB where you need to attend a City Council meeting. My son already done this & earned Cit-in-the-Comm MB previously but he of course went with the troop & took notes again.
There are several more
"overlaps" I am noting but I personally have no problem with synergizing their MB achievements if they are doing the work & it is not retro active. (I.E. if my son was trying to go back & use the previous City Council Mtg 2 years before to count for his current efforts on Communications...which he didn't.) I also think, as was alluded to above, that this
"overlapping" may help them learn how everything is related & connected...which is EXACTLY one of the things I (and BSA)want them to understand when they leave Scouts and go in to the world.
Anyway, I plan to to keep reading and keeping an eye out for other
"overlaps" to maximize the efforts of boys in the troop...and pointing out how they relate and how they individually relate to their respective MB's