Factors Associated with Teenagers’ Willingness to Volunteer with Elderly Persons: Application of the Theory of Planned Behavior (TPB)

The purpose of this study was to investigate the factors associated with teenagers’ willingness to volunteer with elderly persons using an expanded model of the Theory of Planned Behavior (TPB). Participants consisted of 258 ninth-grade students at a large high school in the northern part of Israel. Participants completed a structured questionnaire consisting of 52 items, which examined their attitudes, subjective norms, perceived behavioral control, past behavior, personal identity, and perceived moral obligation. Their willingness to volunteer with elderly persons was assessed using six vignettes, varying in the severity of the elderly person's health and functional conditions described. Additionally, the students’ sociodemographic variables were examined. Overall, students’ willingness to volunteer with elderly persons was low; however, it increased when the elderly person in the vignette was described as relatively healthy. Statistically significant relationships were found between willingness to volunteer and personal identity, as well as between willingness to volunteer and attitudes toward volunteering with elderly persons. A statistically significant but moderate relationship was found between willingness to volunteer and subjective norms. Multiple regression analyses showed that attitudes, subjective norms, and personal identity were the main predictors of willingness to volunteer with elderly persons, explaining 58% of the variance. The expanded model of the Theory of Planned Behavior provided an appropriate framework for understanding the factors associated with teenagers’ willingness to volunteer with elderly persons. Our findings stress the need to develop educational intervention programs regarding gerontologically-related subjects and to disseminate them among the population in general, and among youth in particular.     

Multidimensional analysis system for quantitative chemistry problems: Symbol,macro, micro,and process aspects

There is a consensus regarding the fact that students encounter difficulties in understanding scientific concepts, such as the particulate nature of matter, the mole, and the interpretation of chemical symbols. Researchers and practitioners have been looking for teaching methods to improve students' understanding of quantitative chemistry and their ability to solve related problems. This study describes the Multidimensional Analysis System (MAS), an approach to constructing, classifying, and analyzing quantitative chemistry problems. MAS enables classification based on complexity and transformation levels of a quantitative problem. We define three transformation levels: symbol ? macro, symbol ? micro, and symbol ? process. Applying this framework to teaching and research, we investigated the relationships between MAS‐classified chemistry problems and student achievement in solving these problems. The research population, 241 high school chemistry students, studied problem solving according to MAS for 9 weeks; the control group studied the same topic for the same duration in the traditional way. Student achievement was sorted by mathematics level and gender. We found that the success rate of the entire student population in solving these problems decreased as the problem difficulty increased. Experimental group students scored significantly higher than their control group peers. The improvement in student achievement was significantly dependent on the pretest score and the mathematics level, and independent of gender. Students who studied mathematics in the basic level benefited significantly more from MAS‐based teaching than their peers, whose mathematics level was advanced. Based on the research findings, we recommend applying the multidimensional analysis approach while teaching quantitative problems in chemistry. © 2003 Wiley Periodicals, Inc. J Res Sci Teach 40: 278–302, 2003     

Question‐posing capability as an alternative evaluation method: Analysis of an environmental case study

An effective strategy for improving problem‐solving ability is fostering students' question‐posing capabilities through the use of real‐world problems. This article describes research on scientific question‐posing capabilities among 10th‐grade students who were studying air quality in a cooperative way, using the jigsaw method. Case studies and analyses of daily problems and dilemmas were integrated within the module the Quality of Air around Us, which was designed and developed specially for this research. The students were required to pose questions and cope with real‐life problems while practicing a variety of learning activities, such as reading press or scientific articles, analyzing tables and graphs, and creating posters and advertisements that related to the problem. The students' question‐posing skills were evaluated by using pre‐ and postcase study questionnaires. We found the number, orientation, and complexity of questions students posed to be three indices of question‐posing capability. Following study of the Quality of Air around Us module, a significant increase was observed in the factors of number and complexity of questions students posed. The difference between students at high and low academic levels in the extent of increase in both number and complexity of posed questions was significant. As for orientation, the percentage of solution‐ and opinion‐oriented questions increased in the posttest, and fewer questions dealt with the problem and related hazards. This indicates an increase in students' awareness of the need for and feasibility of seeking practical solutions to a given problem, as well as considerable improvement of their ability to analyze a related case study. On the basis of these findings, we recommend incorporating analysis of question‐posing capability as an alternative evaluation method. To this end, fostering of question posing into the case study–based teaching/learning approach is the preferred strategy, in particular when environmental aspects are involved. © 1999 John Wiley & Sons, Inc. J Res Sci Teach 36: 411–430, 1999     

Question Posing, Inquiry, and Modeling Skills of Chemistry Students in the Case-Based Computerized Laboratory Environment

A new learning unit in chemistry, Case-based Computerized Laboratories (CCL) and Computerized Molecular Modeling (CMM) was developed at the Technion. The CCL and CMM curriculum integrates computerized desktop experiments and molecular modeling with an emphasis on scientific inquiry and case studies. Our research aimed at investigating the effect of the CCL and CMM learning environment on students’ higher-order thinking skills of question posing, inquiry, and modeling. The experimental group included 614 honors 12th grade chemistry students from high schools in Israel who studied according to this learning unit. The comparison group consisted of 155 12th grade chemistry honors students who studied other chemistry programs. Pre- and post-tests questionnaires were used to assess students’ higher-order thinking skills. Students’ responses were analyzed using content analysis rubrics and their statistical analysis. Our findings indicated that the scores of the experimental group students improved significantly in question posing, inquiry and modeling skills from the pre-test to the post-test. The net gain scores of the experimental group students were significantly higher than those of their comparison peers in all three examined skills. In modeling skills, experimental group students significantly improved their achievements in making the transfer from 3D models to structural formulae, but only about half of them were able to transfer from formulae to 3D models. By presenting a case-based chemistry assessment tool and content analysis of students’ responses in this paper, we enable teachers and educators to analyze their students’ higher-order thinking skills both qualitatively and quantitatively.     

Assessing high school chemistry students’ modeling sub-skills in a computerized molecular modeling learning environment

Much knowledge in chemistry exists at a molecular level, inaccessible to direct perception. Chemistry instruction should therefore include multiple visual representations, such as molecular models and symbols. This study describes the implementation and assessment of a learning unit designed for 12th grade chemistry honors students. The organic chemistry part of the unit was taught in a Computerized Molecular Modeling (CMM) learning environment, where students explored daily life organic molecules through assignments and two CMM software packages. The research objective was to investigate the effect of the CMM learning unit on students’ modeling skill and sub-skills, including (a) drawing and transferring between a molecular formula, a structural formula, and a model, and (b) transferring between symbols/models and microscopic, macroscopic, and process chemistry understanding levels. About 600 12th grade chemistry students who studied the CMM unit responded to a reflection questionnaire, and were assessed for their modeling skill and sub-skills via pre- and post-case-based questionnaires. Students indicated that the CMM environment contributed to their understanding of the four chemistry understanding levels and the links among them. Students significantly improved their scores in the five modeling sub-skills. As the complexity of the modeling assignments increased, the number of students who responded correctly and fully decreased. We present a hierarchy of modeling sub-skills, starting with understanding symbols and molecular structures, and ending with mastering the four chemistry understanding levels. We recommend that chemical educators use case-based tools to assess their students’ modeling skill and validate the initial hierarchy with a different set of questions.     

Assessing conceptual change of teachers involved in STES education and curriculum devleopment - the STEMS project approach

Science-Technology-Environment-Society (STES) orientation in science education is currently being implemented in Israeli high schools within the framework of 'science for all' reform worldwide. This paper focuses on assessing the conceptual change of teachers who have been involved in the development, implementation, field-testing and evaluation of several modules. These modules constitute a grade 10-11 high school national curriculum titled STEMS - 'Science, Technology, Environment in Modern Society'. STEMS is aimed at developing an autonomous learner, capable of system thinking, decision making and problem solving within the real life STES context. We sensed that the intrinsic nature of STEMS curriculum requires that the teachers, who will teach it, will also be the developers of its modules. Involvement of this kind makes the teachers responsible for their own conceptual change, explanations and interpretations. Our formative evaluation indicates that the conceptual change of STEMS teachers was gradual. Participants differed with respect to what sort of 'treatment' or experience within the project actually affected who and when. It was apparent that the change occurred with respect to both their content knowledge and pedagogical views. A positive response towards teaching beyond the discipline boundaries was followed by teachers' active involvement and participation in the development process and team discussions. Thus, the STEMS project affected their teaching/learning perception towards interdisciplinarity. These findings are in accord with teachers' support of a life cycle approach for curriculum development as being suitable for achieving the STEMS objectives. The teachers emphasized the need to practice together with their students scientific inquiry and experiment design skills which, foster an autonomous learner. At the end of the first year of the curriculum development process, STEMS was finally conceptualized by the project teachers as a novel way of learning, rather than another sophisticated teaching technique. The major conceptual change was, the switch teachers made from the role of knowledge providers into that of learners. The interplay among action, participation and conceptualization turned out to be instrumental in our life cycle approach for developing the STEMS curriculum.     

High-School Chemistry Students' Performance and Gender Differences in a Computerized Molecular Modeling Learning Environment

Computerized molecular modeling (CMM) contributes to the development of visualization skills via vivid animation of three dimensional representations. Its power to illustrate and explore phenomena in chemistry teaching stems from the convenience and simplicity of building molecules of any size and color in a number of presentation styles. A new CMM-based learning environment for teaching and learning chemistry in Israeli high schools has been designed and implemented. Three tenth grade experimental classes used this discovery CMM approach, while two other classes, who studied the same topic in the customary approach, served as a control group. We investigated the effects of using molecular modeling on students' spatial ability, understanding of new concepts related to geometric and symbolic representations and students' perception of the model concept. Each variable was examined for gender differences. Students of the experimental group performed better than control group students in all three performance aspects. Experimental group students scored higher than the control group students in the achievement test on structure and bonding. Students' spatial ability improved in both groups, but students from the experimental group scored higher. For the average students in the two groups the improvement in all three spatial ability sub-tests —paper folding, card rotation, and cube comparison—was significantly higher for the experimental group. Experimental group students gained better insight into the model concept than the control group and could explain more phenomena with the aid of a variety of models. Hence, CMM helps in particular to improve the examined cognitive aspects of the average student population. In most of the achievement and spatial ability tests no significant differences between the genders were found, but in some aspects of model perception and verbal argumentation differences still exist. Experimental group females improved their model perception more than the control group females in understanding ways to create models and in the role of models as mental structures and prediction tools. Teachers' and students' feedback on the CMM learning environment was found to be positive, as it helped them understand concepts in molecular geometry and bonding. The results of this study suggest that teaching/learning of topics in chemistry that are related to three dimensional structures can be improved by using a discovery approach in a computerized learning environment.     

Choosing Chemistry at Different Education and Career Stages: Chemists,Chemical Engineers,and Teachers

Journal of Science Education and Technology - In response to the realization that qualified applicants’ choice of a career in chemistry is declining, we investigated the factors involved in...     

Experiential Engineering Through iGEM—An Undergraduate Summer Competition in Synthetic Biology

Unlike students in other engineering disciplines, undergraduates in biological engineering typically have limited opportunity to develop design competencies, and even fewer chances to implement their designed projects. The international Genetically Engineered Machines (iGEM) competition is a student Synthetic Biology competition that, in 2009, included 110 teams from across Asia, Europe, Latin America, and the US. Working at their own schools over the summer, the students use a kit of biological parts from the Registry of Standard Biological Parts, as well as new parts of their own design, to build biological systems that operate in living cells. Two years of survey data collected from undergraduates after their iGEM experiences in 2007 and 2008 suggest that both learning and identity as a biological engineer increase as a result of iGEM.