One hundred and eighty subjects took part in the study. They were assigned to two experimental, two control and one Hawthorne control groups. Experimental subjects participated in enrichment activities held outside the school. Control subjects were not given these activities while the Hawthorne control group was taken out on excursions unrelated to their science lessons.

The Cooperative Science Test (COST) was used to assess the acquisition of science concepts while science achievement was based mainly on school science examination scores.

The results indicated that the experimental subjects showed significantly greater improvement in concept attainment and science achievement. Correlations between science concept attainment and science examination scores were positive and significant.

The study concluded that participation in enrichment activities relevant to school science would improve science achievement.