Davis, Rimm, and Siegel (2011) Education of the Gifted and Talented.I did a certification about three years ago on Gifted Ed, so I divided my small groups in all classes into ability groups. My classes are 7th and 8th graders mixed gender learning level 1. The benefits were a pleasant surprise. it was a relief for most of the average students, and the product from the high functioning were the best I had seen in a while. The below and average students had opportunities to be leaders and make meaningful contributions. This year students often choose their own groups which are usually based on ability, but when I do choose groups for them, I still go back to basing them off ability.I hope this is helpful!pam
One of the ways to approach it could be looking into learning styles of your students. There are some (and may be many more) studies available in this regard, but here is one of the examples http://me-serv.me.psu.ac.th/ILS/info/FLAnnals.pdf.
One other option, in regard to FL, would be to look into the needs of L2 vs. Heritage speakers.
This question also could be the one you can share with the SENG (http://sengifted.org/).
2nd Language Training and Research Center
University of Utah