A study published in the Journal of Research on Educational Effectiveness reports on the impact of Word Generation on academic language, vocabulary and reading comprehension outcomes for pupils in grades 4 to 7 (Years 5 to 8).
Word Generation (WG) is a vocabulary programme designed to teach academic vocabulary words through English, maths, science and social studies classroom activities. For this study, 7,725 fourth to seventh grade pupils from 25 schools in the northeast US were randomised within pairs to either treatment or business-as-usual control conditions. In treatment schools, the programme was implemented throughout the school year. In grades 4 and 5 (Years 5 and 6), this involved 12 ten-day long units of 45-50 minutes per day. For grades 6 and 7 (Years 7 and 8), the programme was implemented in six-week long units designed to take 45 minutes each day in science and social studies classes.
At the end of the first year, pupils in grades 4 and 5 also made improvements on their academic language skills (ES = +0.06), and in their reading comprehension at the end of the second year (ES = +0.15). Reading comprehension also improved at the end of the second year for pupils in grades 6 and 7 (ES = +0.10).
The study also showed gains on tests of the specific words emphasised in the programme, but these effects are considered potentially inflated.
Source: Experimental effects of Word Generation on vocabulary, academic language, perspective taking and reading comprehension in high-poverty schools (August 2019), Journal of Research on Educational Effectiveness, 12:3