Conceptions of natural selection: a snapshot of the sense-making process

Several studies have examined the alternative conceptions that students possess about the process of natural selection. The goal of this study was to explore the nature of the changes in students' explanations of evolutionary scenarios. Fifty names were randomly selected from a pool of over 200 high school students who took a pretest prior to and a posttest following instruction about evolution. Teleological and Lamarckian explanations accounted for over half of the students' explanation on the pretest, but dropped to less than 20% on the posttest. Most of the students that, on the pretest, attributed evolutionary change to individual need for a trait or extended use or disuse of some part of the body shifted, on the posttest, to explanations that described the role of a population's variation to the evolutionary process. Explanations that included the idea of spontaneous genetic mutations increased, but this totalled less than 10% of all posttest responses.     

The effects of instruction on college nonmajors' conceptions of respiration and photosynthesis

Students in a college nonscience majors' biology course took tests designed to reveal their conceptions of respiration and photosynthesis before and after course instruction. Even though most students had taken at least a full year of biology, serious misconceptions persisted. Most students gave definitions of respiration, photosynthesis, and food which were markedly different from those generally accepted by biologists. These incorrect definitions were associated with more fundamental misunderstandings about how plants and animals function. Most students could not explain how animal cells use either food or oxygen. They understood plants as vaguely analogous to animals, taking in food through their roots instead of mouths. Previous biology instruction seemed neither to improve student performance on the pretest nor to prepare them to master these conceptions during the course. Course instruction did improve student's understanding, but misconceptions persisted for many students. These results raise fundamental questions about the effectiveness of curriculum and instruction in current high school and college biology courses.     

Student Perceived and Determined Knowledge of Biology Concepts in an Upper-Level Biology Course

Students who lack metacognitive skills can struggle with the learning process. To be effective learners, students should recognize what they know and what they do not know. This study examines the relationship between students’ perception of their knowledge and determined knowledge in an upper-level biology course utilizing a pre/posttest approach. Significant differences in students’ perception of their knowledge and their determined knowledge exist at the beginning (pretest) and end (posttest) of the course. Alignment between student perception and determined knowledge was significantly more accurate on the posttest compared with the pretest. Students whose determined knowledge was in the upper quartile had significantly better alignment between their perception and determined knowledge on the pre- and posttest than students in the lower quartile. No difference exists between how students perceived their knowledge between upper- and lower-quartile students. There was a significant difference in alignment of perception and determined knowledge between males and females on the posttest, with females being more accurate in their perception of knowledge. This study provides evidence of discrepancies that exist between what students perceive they know and what they actually know.     

Scaffolding Middle School Students’ Construction of Scientific Explanations: Comparing a cognitive versus a metacognitive evaluation approach

This study investigated the effects of scaffolds as cognitive prompts and as metacognitive evaluation on seventh-grade students' growth of content knowledge and construction of scientific explanations in five inquiry-based biology activities. Students' scores on multiple-choice pretest and posttest and worksheets for five inquiry-based activities were analyzed. The results show that the students' content knowledge in all conditions significantly increased from the pretest to posttest. Incorporating cognitive prompts with the explanation scaffolds better facilitated knowledge integration and resulted in greater learning gains of content knowledge and better quality evidence and reasoning. The metacognitive evaluation instruction improved all explanation components, especially claims and reasoning. This metacognitive approach also significantly reduced students' over- or underestimation during peer-evaluation by refining their internal standards for the quality of scientific explanations. The ability to accurately evaluate the quality of explanations was strongly associated with better performance on explanation construction. The cognitive prompts and metacognitive evaluation instruction address different aspects of the challenges faced by the students, and show different effects on the enhancement of content knowledge and the quality of scientific explanations. Future directions and suggestions are provided for improving the design of the scaffolds to facilitate the construction of scientific explanations.     

Development and Effectiveness of an Educational Card Game as Supplementary Material in Understanding Selected Topics in Biology

The complex concepts and vocabulary of biology classes discourage many students. In this study, a pretest–posttest model was used to test the effectiveness of an educational card game in reinforcing biological concepts in comparison with traditional teaching methods. The subjects of this study were two biology classes at Bulacan State University–Sarmiento Campus. Both classes received conventional instruction; however, the experimental group''s instruction was supplemented with the card game, while the control group''s instruction was reinforced with traditional exercises and assignments. The score increases from pretest to posttest showed that both methods effectively reinforced biological concepts, but a t test showed that the card game is more effective than traditional teaching methods. Additionally, students from the experimental group evaluated the card game using five criteria: goals, design, organization, playability, and usefulness. The students rated the material very satisfactory.     

Peer Collaboration on a Nonverbal Reasoning Task by Urban,Minority Students

An experimental study of collaborative reasoning in 86 7th-grade minority students from an urban, low-income school was conducted. The students completed items from the Test of Nonverbal Intelligence-Third Edition (TONI-3) and were asked to provide written explanations for their judgments. All students worked individually during the pretest and posttest phases of the study. During the experimental phase, some students worked independently while others worked in small, same-gender or mixed-gender groups. Significant improvements in judgments were evident during the experimental phase for all groups except the single-gender female group. The mixed-gender group reached the ceiling level of performance and outperformed both the students who worked independently and the collaborative, single-gender female group during the experimental phase. Posttest judgment scores declined and were not significantly different from pretest scores for any group. Significant improvements in written explanations for judgments were evident during the experimental phase and were maintained on the posttest by all groups. The students who collaborated had higher percentages of fully correct explanations on the posttest than students who worked alone. Collaborative experiences were beneficial for students' reasoning about unfamiliar, moderately difficult, nonverbal problems.     

The relative responsiveness of concrete operational seventh grade and college students to science instruction

Numerous persons have suggested that instruction should match the developmental level of the learner. Are “concrete operational” college students developmentally the same as “concrete operational” seventh grade students thus in need of identical instruction? Matched concrete operational seventh grade and college students were given identical classroom instruction in probabilistic and correlational reasoning. The college students performed significantly better on posttest measures which appeared to require greater processing of information while significant differences did not exist on less difficult items. Level of cognitive development, field independence, and fluid intelligence correlated moderately with posttest performance for the seventh grade students. Field independence and fluid intelligence correlated moderately with posttest performance for the college students but not pretest knowledge of specific biological concepts and cognitive level. It was concluded that college students are more responsive to instruction due either to (1) greater amount of experience or (2) greater information processing capacity. Implications for science teaching are discussed.     

Using the retrospective pretest to get usable,indirect evidence of student learning

Minimal evidence exists regarding the retrospective pretest’s effectiveness as a tool to obtain usable, indirect evidence of student learning in open admissions institutions. The researcher conducted this study to determine if a retrospective pretest more accurately detected a change in students’ knowledge compared to a conventional pretest–posttest. The researcher designed a 17‐item inventory covering course objectives, and students were randomly assigned to either a retrospective pretest (referred to as post‐then) or a conventional pretest–posttest group. Findings indicated that participants in the post‐then group reported a greater change in knowledge compared to the conventional group. This finding supported the use of the retrospective pretest as a tool for getting usable, indirect evidence of student learning. Future research needs to examine response effect, alternative ways of calculating treatment effect and the confounding influences of other perceptual variables.     

Changes in students' understanding of evolution resulting from different curricular and instructional strategies

This study assessed students' learning of evolution by natural selection within four different sections of an introductory biology course. Each section used a different combination of curricular materials (either traditional or historically rich materials) and instruction (either paired problem solving or traditional lecture). Students in the study completed pre- and postintervention evolution tests. Students' responses were analyzed to create variables for both correct and alternative conceptions of evolution. Pretest and posttest data were used to create difference scores that were compared both within and between teaching sections. Pre-to-post gains were expected in the correct (Darwinian Conception) scores, while pre-to-post losses were expected in the Alternative Conception scores. Also, students in the experimental sections were expected to perform better than those in the traditional sections. Pretest-to-posttest differences within each section showed gains in correct conceptions but few reductions in alternative conceptions. Comparisons between sections support the use of the paired problem-solving instructional strategy in conjunction with the historically rich curriculum. © 1996 John Wiley & Sons, Inc.     

The relationship between students' learning strategies and the change in their misunderstandings during a high school chemistry course

The purposes of this study are as follows: (a) to investigate the relationship between high school students' learning approaches, prior knowledge and attitudes toward chemistry, and their performance on a misunderstandings test; and (b) to describe and analyze the differences between the responses of students with different learning approaches on the same test. Forty-nine suburban high school students enrolled in two sections of New York State Regents Chemistry classes participated in the study. The students' performance on a misunderstandings pretest and the students' learning approach both accounted for a statistically significant proportion of the variance on their performance on the misunderstandings posttest. Additionally, the results showed that the relatively meaningful learners performed significantly better than the relatively rote learners on the misunderstandings posttest.     

Intentions and beliefs in students' understanding and acceptance of biological evolution

We examined the intersection of students' understanding and acceptance of evolution and their epistemological beliefs and cognitive dispositions. Based on previous research, we hypothesized there would be a relation between understanding and acceptance. We also hypothesized that students who viewed knowledge as changing and who have a disposition toward open‐minded thinking would be more likely to accept the scientific explanation of human evolution, and that beliefs and dispositions would not be related to acceptance of a topic that is generally perceived as noncontroversial. Ninety‐three undergraduate students enrolled in a nonmajors biology class completed measures of their (a) content knowledge of evolution and photosynthesis and respiration; (b) acceptance of theories of animal evolution, human evolution, and photosynthesis; and (c) epistemological beliefs and cognitive dispositions. Although our findings did reveal a significant relation between knowledge and reported acceptance for photosynthesis, there was no relation between knowledge and acceptance of animal or human evolution. Epistemological beliefs were related to acceptance, but only to the acceptance of human evolution. There was no relation between students' epistemological beliefs and their general acceptance of animal evolution or photosynthesis. Three subscales, Ambiguous Information, Actively Open‐Minded Thinking, and Belief Identification, were significantly correlated with understanding evolutionary theory. We argue these findings underscore the importance of intentional level constructs, such as epistemological beliefs and cognitive dispositions, in the learning of potentially controversial topics. © 2003 Wiley Periodicals, Inc. J Res Sci Teach 40: 510–528, 2003     

Can Technology Decrease Sexual Risk Behaviors among Young People? Results of a Pilot Study Examining the Effectiveness of a Mobile Application Intervention

College students represent an important population for studying and understanding factors that influence sexual risk given the populations' high risk of sexually transmitted infections and unintended pregnancies. Using a quasi-experimental design, the efficacy of a brief and theory-driven mobile application intervention designed to decrease sexual risk behaviors among young college students (N = 118) was tested. Ninety-six percent (n = 114) of the participants showed an increase in contraceptive use knowledge from pretest to posttest (p = .013). Participants did not show a statistically significant change in intention to reduce sexual risk behaviors or actual risk reduction. This study supports the use of technology to educate college students about sexual health.     

Scientific views and religious beliefs of college students: The case of biological evolution

The purpose of this study was to explore how some university biology majors in Beirut, Lebanon, accommodate the theory of biological evolution with their existing religious beliefs. Sixty-two students enrolled in a required senior biology seminar responded to open-ended questions that addressed (a) their understanding of the theory of evolution, (b) their perception of conflict between this theory and religion, and (c) whether the theory of evolution clashed with their own beliefs about the world. Based on their responses, 15 students were selected for an in-depth exploration of their written responses. Students' answers clustered under 1 of 4 main positions: for evolution, against evolution, compromise, and neutral. The authors suggest that teaching students about the nature of scientific facts, theories, and evidence is more likely to enhance understanding of evolutionary theory if students are given the opportunity to discuss their values and beliefs in relation to scientific knowledge. © 1997 John Wiley & Sons, Inc. J Res Sci Teach 34: 429–445, 1997.     

Student performance and attitudes using personalized mathematics instruction

This study investigated the effects of personalized instruction on the achievement and attitudes of Taiwanese students on two-step mathematics word problems. A total of 136 fourth-graders in a Taiwanese public school participated in the study. Subjects initially completed a Student Survey on which they chose their favorite foods, sports, stores, classmates, and other selections. The most popular items were then used to create personalized math word problems for the pretest, personalized instructional program, and posttest. Subjects were blocked by ability based on their pretest scores and were randomly assigned within ability levels to either a personalized or nonpersonalized version of the print-based instructional program. After finishing the program, subjects completed a student attitude survey and the posttest. A repeated-measures univariate analysis of variance revealed that subjects in the personalized treatment made significantly greater pretest-to-posttest gains than those in the nonpersonalized treatment. Subjects also performed significantly better on the personalized pretest and posttest problems than on the nonpersonalized problems. Personalized subjects and higher-ability students both had significantly more positive attitudes toward the instructional program than did their nonpersonalized and lower-ability counterparts. This research was conducted while he was a doctoral student at Arizona State University.     

Effects of the Integrated Online Advance Organizer Teaching Materials on Students’ Science Achievement and Attitude

This two-group quasi-experimental study investigated the effects of the Online Advance Organizer Concept Teaching Material (ONACOM) integrated with inquiry teaching and expository teaching methods. Grade 7 students’ posttest performances on the light unit achievement and light unit attitude tests controlled for gender, previous semester science grade, and pretest scores were analyzed. No significant treatment effects were found between the inquiry and expository approaches. However, both groups demonstrated significant pretest–posttest gains in achievement and attitude. Independent from the method used, ONACOM was judged effective in both groups as students demonstrated increased achievement and attitude scores. ONACOM has a social and semantic network-aided infrastructure that can be adapted to both methods to increase students’ achievement and improve their attitude.     

Testing the Intercultural Model of Ethical Decision Making With Counselor Trainees

A training intervention using the Intercultural Model of Ethical Decision Making was tested with a sample of 48 counselor trainees enrolled in 3 counseling courses across 2 universities. Postintervention data indicated students' scores increased significantly on 5 of 6 evaluation criteria as well as on the overall total score. Although pretest scores were significantly different between students who had taken a multicultural course and those who had not, there was no posttest difference. Implications and suggestions for future training and research are discussed.     

Co-counseling Supervision in Practicum

Two groups of 12 trainees were exposed to either monitor-modeling or immediate-feedback supervision in their practicum. Ten-minute individual counseling sessions with coached clients were taped before and after the practicum. Three independent judges rated the tapes, using Carkhuff's scales for gross ratings of facultative interpersonal functioning (Carkhuff 1969). Results indicated that (a) the judges' mean ratings from pretest to posttest increased significantly for the monitor-modeling group but not for the immediate-feedback group; (b) although the results approached significance (p < .09), there were no significant differences on the posttest; and (c) the amount of growth from pretest to posttest was significantly greater for the monitor-modeling group. The data supports the relative effectiveness of monitor-modeling supervision. Additional, more extensive evaluations are suggested to more fully assess the relative value of such team approaches to supervision.     

The effectiveness of advance organiser model on students’ academic achievement in learning work and energy

ABSTRACT

The purpose of this study was to investigate the effectiveness of the advance organiser model (AOM) on students’ academic achievement in learning work and energy. The design of the study was quasi-experimental pretest–posttest nonequivalent control groups. The total population of the study was 139 students of three sections in Endabaguna preparatory school in Tigray Region, Ethiopia. Two sections with equivalent means on the pretest were taken to participate in the study purposely and one section assigned as the experimental group and the other section assigned as the control group randomly. The experimental group was taught using the lesson plan based on the AOM, and the control group was taught using the lesson plan based on the conventional teaching method. Pretest and posttest were administered before and after the treatment, respectively. Independent sample t-test was used to analyse the data at the probability level of 0.05. The findings of the study showed that the AOM was more effective than the conventional teaching method with effect size of 0.49. This model was also effective to teach male and female students and objectives namely understanding and application. However, both methods were equally important to teach work and energy under the objective knowledge level.     

The Effect of a Community Project on Sense of Community among Social Work Students: An Exploratory Evaluative Study

This article evaluates the effect of a community project that was adopted by the students of a school of social work in Israel. A quasi-experimental pretest–posttest design was used. The pretest was administered during the planning stage of the project and the posttest a year later, during the implementation period. The findings show a significant positive effect of the project on sense of community among the students. This effect was moderated by students’ ethnic affiliation (Arab or Jewish) and professional commitment. The implications for using community projects to develop a sense of community in schools of social work are discussed.