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Acquisitions metadata within current library integrated systems is not based on any standard; rather, systems vendors generally define structure and content according to proprietary approaches. The authors argue that this cripples library acquisitions practitioners and managers in numerous ways. It renders routine tasks more difficult, jeopardizes the integrity of data during system migration, forces adoption of costly external tracking solutions, and hinders efforts to manage collections and budgets. The authors define acquisitions standards and relate them to existing bibliographic and e-commerce protocols. They discuss reasons for the lack of acquisitions standards and outline first steps in a project to develop them. This paper is based on a presentation given at the Acquisitions Institute at Timberline Lodge, Fourth Annual Conference, held 17-20 May 2003.  相似文献   
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The purpose of this study was to determine whether patterns of strategy use in second, third and fourth grade children’s arithmetic supported Steffe’s model of numerical development. In addition to student-generated strategies, we looked at commonly taught algorithms not considered in Steffe’s model to determine whether these algorithms reflected underlying schemes. 206 children were assessed on their strategy use while solving arithmetic problems in the second grade, the third grade and again in the fourth grade. Factor analyses indicated some support for Steffe’s model, but there were exceptions. Not all children progressed in their number knowledge and strategies as a function of schooling and schooling appeared to affect the types of strategies children use independent of underlying schemes.  相似文献   
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The authors examined whether Reading Rescue continues to be an effective literacy intervention and factors that impact its effectiveness. Data were collected on 143 first-grade students, tutored by 104 tutors at 38 schools. There was significant growth on all foundational skills (ps?ps?d?=?1.62 sight words, d?=?1.68 oral reading/comprehension). Student-level factors of Individualized Education Program status, program completion, number of session, and invented spelling; tutor-level factors of sessions delivered and years of experience; school level factors of school size and percentage of language minority students all predicted grade-level passage or word reading (all ps?2007 Ehri, L. C., Dreyer, L. G., Flugman, B., &; Gross, A. (2007). Reading rescue: An effective tutoring intervention model for language-minority students who are struggling readers in first grade. American Educational Research Journal, 44(2), 414448.[Crossref], [Web of Science ®] [Google Scholar]) study. Efforts should focus on ensuring program completion and increasing program exposure in neediest schools.  相似文献   
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To truly understand gifted performance, it is necessary to merge research on giftedness with current thinking in cognitive development and intelligence. This article presents traditional research on gifted children's cognitive development then considers how the application of newer models and theories from the field of cognitive development can be combined with research on giftedness to change the way people think about gifted performance. First four factors that have often been associated with giftedness are discussed from the perspectives of cognitive developmental psychology and gifted education. Next, emphasis is placed on investigating the strategic development of gifted children. Specifically, R. S. Siegler's (Emerging Minds: The Process of Change in Children's Thinking, Oxford University Press, New York, 1996) model of strategy development is addressed in terms of what it may contribute to understanding gifted cognition. Finally, future lines of research using models from cognitive development and complex systems models of development are recommended.  相似文献   
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This study provides an expanded view of joint attention and its relation to expressive language development. A total of 144 toddlers (40 typically developing, 58 with autism spectrum disorder [ASD], 46 with developmental delay [DD]) participated at 24 and 31 months. Toddlers who screened positive for ASD risk, especially those subsequently diagnosed with ASD, had poorer joint attention skills, joint engagement during parent–toddler interaction, and expressive language. Findings highlight the dynamic relation between joint attention and language development. In the ASD and DD groups, joint engagement predicted later expressive vocabulary, significantly more than predictions based on joint attention skills. Joint engagement was most severely impacted when toddlers did not talk initially and improved markedly if they subsequently began to speak.  相似文献   
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Ethnic–racial identity (ERI) development and ethnic–racial discrimination are two salient experiences among adolescents in the United States. Despite growing awareness of the costs and benefits of these experiences individually, we know little about how they may influence one another. The current study examined competing hypotheses relating discrimination and components of ERI (i.e., exploration, resolution, affirmation) among a sample of Mexican-origin adolescent mothers (N = 181; Mage at Wave 1 = 16.83, SD = 1.01) across six waves of data. Findings revealed that within-person changes in discrimination predicted subsequent ERI resolution and affirmation; however, ERI did not predict subsequent discrimination. Between-person effects of discrimination on affirmation were significant. Our findings underscore the importance of discrimination experiences in shaping Mexican-origin adolescent mothers’ normative developmental competencies.  相似文献   
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