Problem-solving skills of high school chemistry students

What strategies do high school students use when solving chemistry problems? The purpose for conducting this study was to determine the general problem-solving skills that students use in solving problems involving moles, stoichiometry, the gas laws, and molarity. The strategies were examined for success in problem solving for 266 students of varying proportional reasoning ability, using interviews incorporating the think-aloud technique. Data were coded using a scheme based on Polya's heuristics. Results indicated that successful students and those with high proportional reasoning ability tended to use algorithmic reasoning strategies more frequently than nonsuccessful and low proportional reasoning students. However, the majority of all students solved the chemistry problems using only algorithmic methods, and did not understand the chemical concepts on which the problems were based.     

Empowering teacher leadership: a cross-country study

ABSTRACT

The contextual, purpose-driven challenges facing schools and school systems across the world call for creative and innovative responses to revitalize school practices. The process of revitalization will require new thinking, new mindsets within an adaptive school culture and new leadership roles (formal and informal). Often the perception of leadership held within a school is that it is the province of the principal; however, if we move from a top-down model of leadership we can ulitize the capacity of others within to lead the learning. To enable this to happen, teacher leaders need to work with agency and principals need to nurture and grow their formal and informal leadership roles within the school. For many teachers, the question is how they can establish and commit to leadership roles and responsibilities within the school community while remaining in a teaching position. This case study examined the practices of teachers as they experienced leadership across three cross-cultural contexts: Colombia, Canada and Australia. It presents exemplars of teacher leadership in action and provides images of teacher leadership as enacted in addition to an understanding of the factors that were important in supporting their leadership actions.     

Childhood sexual abuse, social support, and psychological outcomes: a loss framework

OBJECTIVE: The objectives of the study were: (a) to develop a scale to assess CSA-related loss among a college sample of CSA survivors (CSALM), (b) to examine the measure's convergent validity through associations among depression, alexithymia, coping, and social support, and (c) to test whether social support moderates the relation between multiple experiences of CSA and loss. METHOD: The study involved a survey methodology and included college-age women (n=116) reporting CSA experiences. RESULTS: Based on the Sexual Victimization Questionnaire (SVQ; [Finkelhor, D. (1979). Sexually victimized children. New York: The Free Press]), 90% of the sample reported CSA before age of 12, 12.3% (n=15) reported CSA before age 12 with an adult over 16, and 42.2% (n=49) reported CSA after age 12 with an adult. Exploratory Factor Analysis of the CSALM revealed a three-factor solution: (a) Loss of Optimism, (b) Loss of Self, and (c) Loss of Childhood. Convergent validity of several scales was evidenced through associations with depression, alexithymia, coping, and social support. Social support from family and friends was found to moderate the association between CSA experiences and loss dimensions. CONCLUSIONS: Findings provide preliminary psychometric support for the CSALM, a tool that will be useful in future investigations of loss among college-age CSA survivors. Findings also support using a loss framework to understand the current mental health of these survivors.     

Big girls don't cry: the effect of child witness demeanor on juror decisions in a child sexual abuse trial

OBJECTIVE: This study investigated the effect of child witness demeanor (defined as crying) on mock jurors' decisions in a simulated First-Degree rape trial. METHOD: One hundred and thirty-three undergraduates serving in the role of mock jurors read a trial summary in which the primary independent variable was the demeanor of the alleged child victim (i.e., calm, teary, hysterical crying). In addition to reading the summary, participants viewed pencil drawings of the witnesses that were presented as "courtroom drawings." RESULTS: The results showed that the teary condition led to more guilty verdicts and a greater belief in the alleged victim than the other demeanor conditions. CONCLUSIONS: Findings from this study indicate that demeanor can impact the perception of a child who is an alleged sexual assault victim in court. However, it is not simply the case that any display of demeanor will lead to a positive outcome for the alleged victim. Instead, it appears that too little or too much emotion from the alleged child victim negatively affected credibility in the eyes of the mock jurors.     

Chasing the sun: a virtual reference service between SAHSLC (SA) and SWICE (UK)

AIM: In 2002, a discussion in the United Kingdom (UK) between South-west Information for Clinical Effectiveness (SWICE) librarians and a member of the South Australian Department of Human Services Libraries' Consortium (SAHSLC) raised the possibility of developing an after-hours virtual reference service between the two consortium groups. The aim of the service is to put medical practitioners in contact with a librarian when urgent help is required in finding clinical medical information after hours. METHODS: A trial project has begun and has been given the name 'Chasing the Sun'. The service will make use of time-zone differences between the UK and Australia, so that librarians at work in another country will be able to answer urgent patient-related queries that cannot wait until normal office hours. RESULTS: This paper looks at the development of 'Chasing the Sun' from initial concept, funding proposal and trial project stage to implementation. It includes details of the groundwork, software evaluation, trials, outcomes, cost and benefits, future directions and potential problems yet to be experienced or overcome. CONCLUSION: This service is the first of its kind between health libraries in the world and offers potential for future worldwide expansion.     

Cultural Vibrancy: Exploring the Preferences of African American Children Toward Culturally Relevant and Non-Culturally Relevant Lessons

Despite the laudable intent of various educational initiatives in raising the achievement level of all children, limited progress has been made. In an effort to diminish the achievement gap of students of color, some researchers have examined the cultural relevancy of the curriculum in promoting student achievement. The purpose of this mixed methods study was to explore the preferences of African American children toward culturally relevant and non-culturally relevant lessons, through a six-week series of lessons in an American History classroom. Critical Race Theory and Racial Identity Development provided the theoretical underpinnings of this study. This study takes place in an ethnically diverse high school in Colorado. Culturally relevant lessons were rich in oral traditions, music, historical connections, and a structured culturally relevant field trip. Non-culturally relevant lessons were administered devoid of cultural referents, and utilized the existing curriculum guide. Study results revealed statistically significant findings for African American children’s preferences for culturally relevant lessons. These lessons were found relevant to their culture when administered by a culturally responsive and caring teacher. Recommendations are made for educators and administrators in promoting achievement through culturally relevant lessons and curriculum.     

Effect of Rasch Calibration on Ability and DIF Estimation in Computer-Adaptive Tests

In a previous simulation study of methods for assessing differential item functioning (DIF) in computer-adaptive tests (Zwick, Thayer, & Wingersky, 1993, 1994), modified versions of the Mantel-Haenszel and standardization methods were found to perform well. In that study, data were generated using the 3-parameter logistic (3PL) model and this same model was assumed in obtaining item parameter estimates. In the current study, the 3PL data were used but the Rasch model was assumed in obtaining the item parameter estimates, which determined the information table used for item selection. Although the obtained DIF statistics were highly correlated with the generating DIF values, they tended to be smaller in magnitude than in the 3PL analysis, resulting in a lower probability of DIF detection. This reduced sensitivity appeared to be related to a degradation in the accuracy of matching. Expected true scores from the Rasch-based computer-adaptive test tended to be biased downward, particularly for lower-ability examinees     

Self‐recording as a Means of Improving Classroom Behaviour in the Secondary School

Two experiments are reported in which children's study behaviour was manipulated systematically within a behavioural paradigm. Both studies were carried out in the remedial department of a large, modern Secondary school in England by a woman teacher. The first involved an individual, a boy whose study behaviour was controlled using self‐recording in a reversal design. On‐task behaviour increased whilst maladaptive responses were reduced and there was a pronounced improvement in the boy's attitude to school work. The second study was a group intervention employing self‐recording which was again successful in improving the on‐task behaviour rate. At the same time it proved possible to gain measures which show clear evidence of improvement in both the quality and quantity of written work produced by the group. In both studies there was some evidence of generalisation of effects.