Abstract
Assessment of performance in science of 13 year old children in autonomic spanish communities: impact or bias. In the present work the main aim was to study the posibilities of using the tests of the National Assessment of Educational Progress (NAEP) in Spain in order to carry out an assessment of performance in our country. A sample of 13 year old spanish children, belonging to diffferent spanish Autonomic Communities were chosen. We carried out a statistical analysis in order to establish if performance differences found are due to real differences or to differential item functioning in the different Communities studied.
