Cumulative Multi-Year Learning Gains
RCTJournal Article
Single-year educational interventions often produce temporary learning gains that decay rapidly unless foundational reinforcement is sustained continuously across consecutive academic grades.
Picture this
Sustaining remedial support over two consecutive years operates like learning a foreign language; mastering fundamental vocabulary in year one allows the student to absorb sentence structure in year two, locking in permanent fluency.
What the evidence says
Two consecutive years of remedial exposure increased math test scores by 0.612 standard deviations and total test scores by 0.407 standard deviations, significantly exceeding single-year gains.
- Who was studied
- N = 3,188 Grade 3 students tracked through Grade 4 over two consecutive years in Mumbai municipal primary schools.
- How
- Longitudinal randomized controlled trial tracking individual student test score improvements from baseline pretest in Year 1 to posttest in Year 2.
What to do
Structure foundational remedial instruction programs to run continuously across at least two consecutive primary grades to solidify long-term learning retention.
From the source
"In Mumbai, the effect of two years of treatment (from year 1 pretest score to year 2 posttest score) is substantially larger than that in either individual year (0.60 standard deviations in math, for example, versus 0.40 for year 2 in grade 4)."
Remedying Education: Evidence from Two Randomized Experiments in India