Improving literacy and numeracy in the early grades is one of the toughest challenges facing education systems worldwide. Kenya’s journey offers a rare example of how rigorous research can directly shape national policy and deliver results at scale.
The pilot: PRIMR’s experimental evidence
The Kenya Primary Math and Reading (PRIMR) Initiative was a randomised controlled trial across 847 schools in Bungoma and Machakos counties.
- The pilot tested three combinations of intervention “ingredients”:
- Teacher professional development (PD) and coaching
- PD + coaching + revised student textbooks (1:1 ratio) PD + coaching + textbooks + structured teachers’ guides
The findings of the trial, which were published in World Development (Piper et al., 2018), showed that two of the three combinations significantly improved outcomes.
The full package – PD, coaching, 1:1 textbooks, and structured guides – was the most effective, driving the largest improvements in oral reading fluency (Kiswahili and English) and conceptual/procedural numeracy. Textbooks alone were not enough; their impact depended on teacher training and structured use. In addition, structured teachers’ guides helped teachers adopt new methods, especially in contexts where preparation and academic background are limited.
Scaling up: Tusome early literacy programme
Kenya didn’t stop at pilot success. In 2015, the government launched Tusome (“Let’s Read”), embedding PRIMR’s lessons into a nationwide programme. Tusome included nearly all the proven elements:
- Training and coaching (with optimal coach-to-teacher ratios of 15:1)
- New books at a 1:1 ratio
- Structured teachers’ guides with daily scripted lessons
- ICT support (tablets for teachers and coaches, e-readers tested for learners)
By 2017, Curriculum Support Officers (CSOs) conducted over 21,000 classroom visits, hitting 88% of targets, and monitoring showed 75% of teachers were teaching 75% of the scripted lessons.
Benchmarks were set at 17 cwpm (emergent) and 45 cwpm (fluent) in Kiswahili, and 30 cwpm (emergent) and 65 cwpm (fluent) in English. External evaluation (MSI, 2017) found average effect sizes of 1.04 in English and 0.76 in Kiswahili for grades 1-2 — large impacts by global standards.
Tusome reached 1.2 million children in early rollout, scaling to more than five million learners nationwide. However, scaling required affordability. Typical bookstore textbook prices were around $4.50, but government printing under Tusome reduced prices to $0.85-$2.00 per book. This cost-efficiency made universal distribution possible.
Lessons for the global south
Kenya’s pathway shows what’s possible when evidence drives reform.
- Pilot with rigour – test which ingredients matter most.
- Design for scale – use government structures like CSOs.
- Embed accountability – track progress with national data dashboards.
- Procure smartly – ensure materials are affordable at scale.
Kenya proved that integrated interventions – teacher PD, coaching, books, and structured guides – deliver the largest, most cost-effective gains. Kenya’s Tusome programme is now one of the world’s strongest examples of evidence-based literacy reform.
For countries wrestling with early grade learning crises, the lesson is simple: don’t just guess; test, scale, and sustain.
