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Liu, Xiufeng; Zhang, Baohui; Liang, Ling L.; Fulmer, Gavin; Kim, Beaumie; Yuan, Haiquan – Science Education, 2009
Alignment between content standards and standardized tests is a significant issue to society, science pedagogy, and test validation. To better understand the issues related to alignment, this study compares the alignment in physics among three education systems: Jiangsu (China), New York State (United States), and Singapore. The same coding…
Descriptors: Standardized Tests, Academic Standards, Physics, Foreign Countries
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Zhang, BaoHui; Liu, Xiufeng; Krajcik, Joseph S. – Science Education, 2006
Holding the premise that the development of expertise is a continuous process, this study concerns expert models and modeling processes associated with a modeling tool called Model-It. Five advanced Ph.D. students in environmental engineering and public health used Model-It to create and test models of water quality. Using "think aloud" technique…
Descriptors: Cognitive Processes, Water Quality, Public Health, Models
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Liu, Xiufeng; Lesniak, Kathleen M. – Science Education, 2005
Using the US national sample from the Third International Mathematics and Science Study (TIMSS) and the Rasch modeling method, this study identified the conceptual progression sequence of various matter concept aspects, and compared students' latent abilities against the sequence. We found that the four matter aspects, i.e. conservation, physical…
Descriptors: Scientific Concepts, Elementary Secondary Education, Models, Conservation (Concept)
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Liu, Xiufeng – Science Education, 2004
In this article, we adopted the relational conceptual change as our theoretical framework to accommodate current views of conceptual change such as ontological beliefs, epistemological commitment, and social/affective contexts commonly mentioned in the literature. We used a specific concept mapping format and process--digraphs and digraphing--as…
Descriptors: Grade 12, Concept Mapping