This study had three purposes. First, to develop and validate a criterion-referenced test to measure science knowledge of students who finished the second cycle of the Basic General Education (6th grade). Second, to assess the performance of the entire Costa Rican population of sixth graders and, third, to analyze the results according to some…

This paper reports on a pilot study of 34 sixth-grade students engaged in mathematical explorations that was carried out in the context of a national Logo project in Costa Rica. Students worked in pairs investigating a mathematical microworld written in Logo. The investigation had three phases: (1) open exploration of the microworld, during which…