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

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.

Teacher Blog– Her Journey in a Dual Language Classroom

Through SpanglishBaby once again, we get a great link to a teacher blog. LearningIn2 is a blog by a teacher who teaches in a dual language classroom. She shares information on reading in two languages and what she does in her Dual Language classroom. Would be fun to have her build a network of other teachers in Dual Language classrooms so that they can capitalize on:

Teaching experiences
Exchange in materials
Websites of interest
and many more issues during their very critical and important journey.