Multilevel bifactor item response theory (IRT) models are commonly used to account for features of the data that are related to the sampling and measurement processes used to gather those data. These models conventionally make assumptions about the portions of the data structure that represent these features. Unfortunately, when data violate these…

Scientists, science teachers, and serious students recognize that success in science classes requires consistent practice--including study at home. Whether balancing chemical equations, calculating angular momentum, or memorizing the steps of cell division, students must review material repeatedly to fully understand new ideas--and must practice…

The Programme for International Student Assessment (PISA) is a worldwide research project involving schools and students in over 70 countries. It is run by the Organisation for Economic Co-operation and Development (OECD), takes place every three years, and is designed to examine how 15-year-olds can apply what they have learned in school to real…

There have been many studies of the reasons why female students do not take physics. However, all scientists know that the measurement in any experiment is influenced by the act of measurement. Perhaps this is also true when undertaking surveys to assess why girls do not choose physics. Here a female A-level student who achieved grade A* at GCSE…

According to the Bureau of Labor Statistics (BLS), jobs in computer systems design and related services--a field dependent on high-level math and problem-solving skills--are projected to grow by 45% between 2008 and 2018. Further, more than one in four (26%) of all new jobs created in the U.S. economy during this time will be in the healthcare and…

This booklet provides parents of children ages 3 through 10 with information, tools, and activities they can use in the home and community to help their child develop an interest in the sciences and learn about the world around them. This brochure was drawn from the larger booklet in the "Helping Your Child" series, "Helping Your Child Learn…

This article is an introduction to the international assessments Programme for International Student Assessment (PISA) and the Trends in International Mathematics and Science Study (TIMSS) and a review of results from 2003. International comparisons, especially in the media, have elevated interest in science education and stimulated discussions…

Problem-based learning (PBL) has great potential for inspiring K-12 learning. KaAMS, a NASA funded project and an example of PBL, was designed to help teachers inspire middle school students to learn science. The students participate as scientists investigating environmental problems using NASA airborne remote sensing data. Two PBL modules were…