Mrs. juarez divides her class into small, ethnically diverse groups. she then requires each student to become an "expert" in one aspect of an overall project and then teach it to other members of his or her group. mrs. juarez is using:

She is using the Jigsaw classroom technique. This technique was invented inthe early 1970's. It reduces racism, helps students achieve better grades and have more fun, which makes them like school more. It also forces student to learn about team work and cooperate with each other, since they need each other to study and learn

It is meant that like tapestry scientific theories often need to pull out since they are not relevant and often times the whole chain of theories may be pulled out.