The present study explores how in-service secondary education Greek biology teachers understand aspects of the concept of ecosystem under the assumption that the ecosystem is an ill-defined concept. If it is to be considered a holistic entity, the ecosystem acquires its definitional features within the ecological field of systems ecology, which…

The National Assessment Governing Board has a legislatively mandated responsibility to develop National Assessment of Educational Progress (NAEP) achievement levels. The Board Policy Statement on Developing Student Achievement Levels for the National Assessment of Educational Progress provides policy definitions of "NAEP Basic,"…

This paper explores the dimensions of knowledge and the ways of thinking (procedural or proceptual thinking) adopted by 157 Lebanese students in different grades when defining and identifying irrational numbers when locating them on the number line. It searches for a relation between the performance of the participants and their different grades.…

Education Commission of the States has researched how states use college-readiness assessments to make the most of the 12th-grade year in all states. This interactive resource provides links to the 50-state comparisons showing how all states approach specific 12th-grade transitions policies: (1) Determinations; (2) Intervention; (3) Acceleration;…

Due to the growing importance of technology and engineering in the educational landscape, and to support America's ability to contribute to and compete in a global economy, the National Assessment Governing Board (NAGB) initiated development of the first NAEP Technology and Engineering Literacy (TEL) Assessment. Relating to national efforts in…

Nearly all high school seniors plan college, but many low-income students do not enroll. Moreover, among students who do enroll, low-income students often pursue less dependable college pathways. While research typically focuses on college cost and academic preparation as explanations of socioeconomic differences in enrollment outcomes, other…

This article deals with 12th-grade students' conceptions of a mathematical definition. Their conceptions of a definition were revealed through individual and group activities in which they were asked to consider a number of possible definitions of four mathematical concepts: two geometric and two analytic. Data consisted of written responses to…