Review article 65 Hargreaves, Melame., et al. 2004. Computer or paper? That is the question: Does the medium in which assessment questions are presented affect children’s performance in mathematics? Educational Research, 46 (1), 29-42. This article examines English children’s performance on a computer mathematics assessment compared with a pencil-and-paper assessment. Four assessments, two mathematics pencil-and-paper tests (P 1 and P 2) and two computers tests (C 1 and C 2), were used in the study. The computer tests were identical to the pencil-and-paper tests in every way other than the medium. A sample of 260, 10 year old children was used in the study. Results show that each sample had a higher mean score on the computer than they did on the pencil-and-paper tests. This implies that the children in this study performed better using the computer medium of the assessment. The computer tests were found to have an overall positive effect on children’s performance, although not for every child and, in some instances, the computer assessment limited the way in which a question could be answered. The authors argue that previous computer use did not appear to affect performance on the computer medium. They suggest that if computers are to be used for providing more interesting and dynamic assessment, then care must be taken to ensure questions are specifically written for and tested in this medium to alert test developers to potential problems. Keywords: Computer mathematics assessment; England;