This paper demonstrates the positive impact of learning through ecological fieldwork upon children's ability to write, and to write about science. Specifically we have carried out a relatively large-scale study (involving 379 children aged 9-11 years from 8 primary schools in North East England) comparing intervention classes (involved in…

Estimates of the costs of including hands-on measures of science skills in a large-scale assessment program were derived from a field trial involving more than 2,000 fifth and sixth graders. Results suggest that complexity makes hands-on assessments more than three times as expensive as open-ended writing assessments. (SLD)