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51.
This study examined the relationship between students' (N = 229) concepts of size and scale and students' achievement in science and mathematics over a 3-year period. Size and scale are considered one of the big ideas in science that permeates disparate science and mathematics content areas, yet little is known about the relationship between students' conceptualization of size and scale and students' achievement in science and mathematics. The study used a modified panel longitudinal design to follow the same class of students over a 3-year period. The goal was to explore whether understandings of size and scale are related to achievement in mathematics and science. Results indicated a strong positive significant relationship existed between students' understanding of size and scale and students' science achievement in grades 5 and 8. There was a positive significant relationship between students' concepts of size and scale and students' mathematics achievement in grades 5, 6, 7, and 8. An examination of the relationships is included as well as a discussion of the integration of crosscutting concepts into science and mathematics instruction as a way to support deep learning.  相似文献   
52.
Instructional design can be characterized as a complex problem-solving task, yet little is known about what cognitive processes it requires. This research sought to identify differences in the thinking of expert and novice instructional designers given the same design task. A talk-aloud procedure was used to capture their problem-solving procedures and representations while designing instruction for a computer simulation. A coding scheme based on design principles, strategies, and subtasks was applied to the verbal protocols. Quantitative and qualitative analyses indicated that expert and novice instructional designers do appear to use divergent design paths. These design paths were further analyzed using design trees.  相似文献   
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55.
Community college administrators look for strategies to help students. GRASP (Gaining Retention and Achievement for Students Program) is a semester-long faculty development program that coaches community college instructors about simple, effective teaching strategies that promote student academic achievement. GRASP is founded on the belief that academic achievement is based on good teaching, which begins with faculty development. The major assumption for GRASP is that faculty are the single most important factor for student success. GRASP was offered at Doña Ana Community College (DACC). Located in Las Cruces, New Mexico, just 40 miles from the border of Mexico, DACC has a student population that is 70% minority. Results for GRASP indicate that overall student success improved by 7.9%, and that overall student retention improved by 4.0% for students participating in GRASP.  相似文献   
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The authors tested whether students can be taught to better understand conventional representations in diagrams, photographs, and other visual representations in science textbooks. The authors developed a teacher-delivered, workbook-and-discussion–based classroom instructional method called Conventions of Diagrams (COD). The authors trained 1 experienced teacher to deliver COD to two 10th-grade biology classes (n = 31) and compared gains in diagram comprehension from COD to those from a business-as-usual control condition (n = 30) in 2 classrooms taught by the same teacher. Students in the COD condition showed statistically significantly greater growth in comprehension of literal and inferential biology diagrams. The control condition in some cases advantaged high-spatial, high-knowledge students, whereas the COD condition for the most part did not. Entries in the COD workbooks were analyzed for amount of student effort. Students with a combination of low pretest biology knowledge and low effort showed much lower gains from pretest to posttest on the inferential biology diagrams measure than did other students in the COD condition.  相似文献   
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Students' metacognitive skills and perceptions are considered important variables for high-quality learning. In this study, students' perceptions were used to identify histological threshold concepts (integrative, irreversible, transformative, and troublesome) in three health sciences curricula. A specific questionnaire was developed and validated to characterize students' perceptions of histological threshold concepts. A sample of 410 undergraduate students enrolled in the dentistry, medicine, and pharmacy degree programs participated in the study. Concepts assessed in the study were clustered to ten categories (factors) by exploratory and confirmatory factor analysis. Concepts linked to tissue organization and tissue functional states received the highest scores from students in all degree programs, suggesting that the process of learning histology requires the integration of both static concepts related to the constituent elements of tissues and dynamic concepts such as stem cells as a tissue renewal substrate, or the euplasic, proplasic and retroplasic states of tissues. The complexity of integrating static and dynamic concepts may pose a challenging barrier to the comprehension of histology. In addition, several differences were detected among the students in different degree programs. Dentistry students more often perceived morphostructural concepts as threshold concepts, whereas medical students highlighted concepts related to two-dimensional microscopic identification. Lastly, pharmacy students identified concepts related to tissue general activity as critical for the comprehension and learning of histology. The identification of threshold concepts through students' perceptions is potentially useful to improve the teaching and learning process in health sciences curricula.  相似文献   
58.
Understanding genetic drift is crucial for a comprehensive understanding of biology, yet it is difficult to learn because it combines the conceptual challenges of both evolution and randomness. To help assess strategies for teaching genetic drift, we have developed and evaluated the Genetic Drift Inventory (GeDI), a concept inventory that measures upper-division students’ understanding of this concept. We used an iterative approach that included extensive interviews and field tests involving 1723 students across five different undergraduate campuses. The GeDI consists of 22 agree–disagree statements that assess four key concepts and six misconceptions. Student scores ranged from 4/22 to 22/22. Statements ranged in mean difficulty from 0.29 to 0.80 and in discrimination from 0.09 to 0.46. The internal consistency, as measured with Cronbach''s alpha, ranged from 0.58 to 0.88 across five iterations. Test–retest analysis resulted in a coefficient of stability of 0.82. The true–false format means that the GeDI can test how well students grasp key concepts central to understanding genetic drift, while simultaneously testing for the presence of misconceptions that indicate an incomplete understanding of genetic drift. The insights gained from this testing will, over time, allow us to improve instruction about this key component of evolution.  相似文献   
59.
The purpose of this study was to describe behavioural and emotional symptoms and to examine the effect of abuse-related factors, family responses to disclosure, and child self-blame on these symptoms in children presenting for medical evaluations after disclosure of sexual abuse. A retrospective review was conducted of 501 children ages 8–17. Trauma symptoms were determined by two sets of qualitative measures. Abstracted data included gender, ethnicity, and age; severity of abuse and abuser relationship to child; child responses regarding difficulty with sleep, school, appetite/weight, sadness, or self-harm, parent belief in abuse disclosure, and abuse-specific self-blame; responses to the Trauma Symptom Checklist in Children-Alternate; and the parent's degree of belief in the child's sexual abuse disclosure. Overall, 83% of the children had at least one trauma symptom; 60% had difficulty sleeping and one-third had thoughts of self-harm. Child age and abuse severity were associated with 3 of 12 trauma symptoms, and abuse-specific self-blame was associated with 10 trauma symptoms, after controlling for other variables. The children of parents who did not completely believe the initial disclosure of abuse were twice as likely to endorse self-blame as children of parents who completely believed the initial disclosure. Screening for behavioural and emotional problems during the medical assessment of suspected sexual abuse should include assessment of self-blame and family responses to the child's disclosures. In addition, parents should be informed of the importance of believing their child during the initial disclosure of abuse and of the impact this has on the child's emotional response to the abuse.  相似文献   
60.
The American Association for the Advancement of Science 2011 report Vision and Change in Undergraduate Biology Education encourages the teaching of developmental biology as an important part of teaching evolution. Recently, however, we found that biology majors often lack the developmental knowledge needed to understand evolutionary developmental biology, or “evo-devo.” To assist in efforts to improve evo-devo instruction among undergraduate biology majors, we designed a concept inventory (CI) for evolutionary developmental biology, the EvoDevoCI. The CI measures student understanding of six core evo-devo concepts using four scenarios and 11 multiple-choice items, all inspired by authentic scientific examples. Distracters were designed to represent the common conceptual difficulties students have with each evo-devo concept. The tool was validated by experts and administered at four institutions to 1191 students during preliminary (n = 652) and final (n = 539) field trials. We used student responses to evaluate the readability, difficulty, discriminability, validity, and reliability of the EvoDevoCI, which included items ranging in difficulty from 0.22–0.55 and in discriminability from 0.19–0.38. Such measures suggest the EvoDevoCI is an effective tool for assessing student understanding of evo-devo concepts and the prevalence of associated common conceptual difficulties among both novice and advanced undergraduate biology majors.  相似文献   
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