Despite of language, what type of ability grouping should teachers use?

Claudia is the Endowed Joan Wieler Arno 49 Professor at…
Sharon Vaughn answers that in the International Reading Association blog site -the following question from a teacher.
What Type of Literature Circle Grouping Works Best—Same Ability or Mixed Ability?
Click here to read what latest research says about ability, mixed, pairing, small group and 1 to 1 instructional grouping. Basic summary use it all!– find your purpose, identify the standards you are addressing, look at your data and provide a lot of high engaged opportunities in the classroom. The wonderful opportunity here is that this recommendation can be done in any language and it will not only support learning of core tier 1 instruction but also provide opportunity for additional options for interventions.
Claudia is the Endowed Joan Wieler Arno 49 Professor at Lasell University. She is currently a full professor of education and chair of the Education Program. Claudia has been a teacher, researcher, consultant, and professor of special education.