Can Tracking Improve Learning?

 

“Tracking,” or grouping students according to their performance and ability level, was used quite standardly when I was in elementary school.  However, by the 1980’s, “tracking,” was almost completely eliminated as being unfair, especially to those students placed in the lowest of the learning groups.

 

Tracking is resurfacing abroad and at home with some interesting results.  Here is one study out of Kenya.  What do you think?

Wendy

 

Can Tracking Improve Learning?

Evidence from Kenya

By Esther Duflo, Pascaline Dupas and Michael Kremer  

Tracking students into different classrooms according to their prior academic performance is controversial among both scholars and policymakers. If teachers find it easier to teach a homogeneous group of students, tracking could enhance school effectiveness and raise test scores of both low- and high-ability students. But if students benefit from learning with higher-achieving peers, tracking could disadvantage lower-achieving students, thereby exacerbating inequality.

A central challenge of education systems in developing countries—the context for which our results are most relevant—is that students in the same grades and classrooms are extremely diverse. Our results show that grouping students by preparedness or prior achievement and focusing the teaching material at the most appropriate level could potentially have large positive effects with little or no additional resource cost. One could also target more resources to the weaker group, further helping them to catch up with their more-advanced counterparts. It is often suggested that there is a trade-off between the value of targeting resources to weaker students, and the costs imposed on them by separating them from stronger students. We find no evidence for such a trade-off in this context.

Our initial sample consists of approximately 10,000 students enrolled in 1st grade in March 2005 in one of the 121 primary schools participating in the study. The outcome of interest is student academic achievement, as measured by scores on a standardized math and language test first administered in all schools 18 months after the start of the program. Trained proctors administered the test, which was then graded blindly by data processors. In each school, 60 students (30 per class) were drawn from the initial sample to participate in the tests. If a class had more than 30 students, students were randomly sampled.

One hypothesis consistent with both the tracking results and the effects from random peer assignment is that tracking by initial achievement improves student learning because it allows teachers to focus instruction. Teaching a more homogeneous group of students might allow teachers to adjust the material covered and the pace of instruction to students’ needs. For example, a teacher might begin with more basic material and instruct at a slower pace, providing more repetition and reinforcement, when students are initially less prepared. With a group of initially higher-achieving students, the teacher can increase the complexity of the tasks and pupils can learn at a faster pace. With a heterogeneous group, they may be compelled to cover both simple and advanced material, spending less time on each, which would hurt all students.

The results of this study imply that being the best student in a class of relatively weak students and being the worst student in a class of relatively strong students are both better than being the middle student in a heterogeneous class. This evidence suggests that students benefit from homogeneity because the teacher does not need to spend time addressing the needs of students performing at widely varying levels. Our results confirm that students in tracked classes seem to have benefited from more-focused teaching and perhaps also from greater teacher effort.

Esther Duflo is professor of economics at the Massachusetts Institute of Technology. Pascaline Dupas is assistant professor of economics at University of California, Los Angeles. Michael Kremer is professor of economics at Harvard University.