Building an organized knowledge base: Concept mapping and achievement in secondary school physics

Direct teaching of problem-solving methods to high school physics students met with little success. Expert problem solving depended upon an organized knowledge base. Concept mapping was found to be a key to organizing an effective knowledge base. The investigation of the effect of the degree of concept mapping on achievement was the purpose of this study. Six intact high school physics classes, taught by this investigator, took part in the study. Two classes were control groups and received standard instruction. Four classes received six weeks of concept-mapping instruction prior to the unit under study. Two of these four classes were the low-level treatment group and were required to submit concept maps at the conclusion of the instruction. The other two classes were the high-level treatment group and were required to submit concept maps at the beginning and at the conclusion of the unit under study. One class from each treatment group took a pretest prior to instruction. An analysis of the posttest results revealed no pretest sensitization. A one-way analysis of covariance indicated a significant main effect for the treatment level at the p < 0.05 level. A pair of single-df comparisons of the adjusted treatment means resulted in significant differences (p < 0.05) between the control group and the average of the treatment means as well as between the two experimental groups. It can be concluded that for this sample (upper-middle-class high school physics students) mapping concepts prior to, during, and subsequent to instruction led to greater achievement as measured by posttest scores.     

The effectiveness of computer and tablet assisted intervention in early childhood students’ understanding of numbers. An empirical study conducted in Greece

The present study aimed to assess the effect of two different types of digital technologies (computers and tablets) in early childhood students’ understanding of numbers. Three hundred and sixty-five children (mean age in months, M?=?62.0, SD?=?5.5) from 21 kindergarten classes were randomly assigned to two intervention groups and a business-as-usual control group. The interventions were conducted over 24 half-hour lessons. Data was collected during the 2013–2014 school year using a three-step research procedure. Students’ knowledge about numbers was assessed using the Test of Early Mathematics Ability-3 (TEMA-3). Findings were that (a) both experimental groups significantly outperformed the control group on the posttest, (b) the group that used tablet computers significantly outperformed the group that used personal computers on the posttest, and (c) there was no significant difference between genders on the posttest. Our findings support that computers and especially tablets, when combined with the use of developmentally appropriate software into the children’s daily routines, may provide a substantial contribution to early childhood students’ comprehension of numbers.     

History of Science as an Instructional Context: Student Learning in Genetics and Nature of Science

This study (1) explores the effectiveness of the contextualized history of science on student learning of nature of science (NOS) and genetics content knowledge (GCK), especially interrelationships among various genetics concepts, in high school biology classrooms; (2) provides an exemplar for teachers on how to utilize history of science in genetics instruction; and (3) suggests a modified concept mapping assessment tool for both NOS and GCK. A quasi-experimental control group research design was utilized with pretests, posttests, and delayed posttests, combining qualitative data and quantitative data. The experimental group was taught with historical curricular lessons, while the control group was taught with non-historical curricular lessons. The results indicated that students in the experimental group developed better understanding in targeted aspects of NOS immediately after the intervention and retained their learning 2 months after the intervention. Both groups developed similar genetics knowledge in the posttest, and revealed a slight decay in their understanding in the delayed posttest.     

Effect of explicit problem solving instruction on high school students' problem-solving performance and conceptual understanding of physics

In this study a two-sample, pre/posttest, quasi-experimental design was used to investigate the effect of explicit problem-solving instruction on high school students' conceptual understanding of physics. Eight physics classes, with a total of 145 students, were randomly assigned to either a treatment or comparison group. The four treatment classes were taught how to use an explicit problem-solving strategy, while the four comparison classes were taught how to use a textbook problem-solving strategy. Students' problem-solving performance and conceptual understanding were assessed both before and after instruction. The results indicated that the explicit strategy improved the quality and completeness of students' physics representations more than the textbook strategy, but there was no difference between the two strategies on match of equations with representations, organization, or mathematical execution. In terms of conceptual understanding, there was no overall difference between the two groups; however, there was a significant interaction between the sex of the students and group. The explicit strategy appeared to benefit female students, while the textbook strategy appeared to benefit male students. The implications of these results for physics instruction are discussed. © 1997 John Wiley & Sons, Inc. J Res Sci Teach 34: 551–570, 1997.     

The effects of the use of activities of sapa on the oral communication skills of disadvantaged kindergarten children

The study investigated the effects of participation in the activities of Science-A Process Approach (SAPA) on the oral communication skills of disadvantaged kindergarten children. Experimental-control group, pretest-posttest research design was employed. The investigator designed the Test of Oral Communication Skills (TOCS) to measure students' oral communication skills. Two experimental groups (one morning and one afternoon, N = 52) and two control groups (one morning and one afternoon, N = 48) were randomly assigned from two kindergarten classrooms (morning and afternoon classes in each) in an inner-city school in Columbus, Ohio. The investigator provided the science instruction to all students. Experimental subjects received 22 half-hour lessons from exercises a through k of Part A, SAPA. Control subjects received 22 lessons from Springboards to Science, a teacher demonstration, class discussion type of kindergarten curricuoum used in the school system. The treatment period spanned 12 academic weeks. Analysis of variance of TOCS pretest scores showed no significant differences among any of the means of the four groups. Analysis of covariance of TOCS posttest scores revealed differences significant at .05 or beyond in the mean scores of the experimental groups and control groups for total oral and total receiving skills and for six of the eight subskills measured by TOCS. Application of the Tukey (b) test revealed that experimental group mean scores exceeded control group mean scores in every TOCS skill and subskill area and that in total oral transmitting subskills both experimental group mean scores were significantly greater at .05 level or beyond than corresponding mean scores for both control groups. Within the parameters of this study, it may be concluded that when the activities and teaching strategies of SAPA curriculum are presented to disadvantaged kindergarten children, their oral communication skills, especially the transmitting (speaking) skills, are clearly enhanced.     

Human Figure Drawings by Schooled and Unschooled Children in Papua New Guinea

Human figure drawings were collected from 287 schooled and unschooled children, aged between 10 and 15 years, living in a remote region of the Western Highlands Province of Papua New Guinea, an area with no tradition of graphic art. A classification and ordinal scoring system was devised which encompassed graphic productions ranging from scribbles to conventional competent human figure drawings. The effects of school experience on drawing, even brief and indirect experience, were found to be significant. All the children attending school drew only conventional human figures, but the whole range of drawings, scribbles, transitional forms, and conventional human figure drawings were found in the unschooled children's attempts. Nonrepresentational scribbles and shapes were largely produced by unschooled children living in remote villages without a school, trade store, or mission. Some children appeared to be able to draw representations of the human figure without going through a scribbling stage. The material is considered in relation to other reports on drawings produced by children from societies with little or no indigenous graphic art. The results are discussed in relation to various theories on the development of drawing and representational abilities.     

Effectiveness of lab-work learning environments in and out of school: A cluster randomized study

The issue of how to increase student motivation and achievement in science subjects is considered to be a major challenge in modern school systems. Lab-work learning environments in which students get direct (“hands-on”) experience with science content that is related to their everyday lives are posited to have positive effects on state/trait motivation and achievement, but there is a lack of sound empirical evidence to support this claim. In the present study, the effectiveness of a lab-work learning unit on the topic of “the chemistry of starch” was examined by applying a cluster randomized field study with three treatment conditions with lab-work elements and a control group. The first group was taught with lab-work elements in School only, the second group (SCOL & school) was taught in a combined condition encompassing both a SCOL (Science Center Outreach Lab) visit and classroom learning, the third group was taught entirely outside the school environment (SCOL only), and the fourth group was a wait-list control group, which was not exposed to a “starch” curriculum at the time of this study. Data from 1854 students were gathered in 67 ninth-grade classes on state motivation during the intervention and on trait motivation and achievement at pretest, posttest, and follow-up. Multilevel regression analyses revealed several differences between the lab-work conditions and the control group: Whereas the hands-on practical approach effectively enhanced state motivation with positive effects on joy, situational interest, situational competence, and reduced boredom in all three treatment conditions (School only, SCOL & school, and SCOL only), there were differences in trait effects: learning at school (School only and SCOL &school) increased achievement (posttest and follow-up), whereas the SCOL visit resulted in a small and spurious increase in trait motivation (reduced cost and increased competence beliefs only on the posttest).     

Argumentation Practices in Classroom: Pre-service teachers' conceptual understanding of chemical equilibrium

This study examines the impact of argumentation practices on pre-service teachers' understanding of chemical equilibrium. The sample consisted of 100 pre-service teachers in two classes of a public university. One of these classes was assigned as experimental and the other as control group, randomly. In the experimental group, the subject of chemical equilibrium was taught by using argumentative practices and the participants were encouraged to participate in the lessons actively. However, the instructor taught the same subject by using the lecturing method without engaging argumentative activities in the control group. The Chemical Equilibrium Concept Test and Written Argumentation Survey were administered to all participants to assess their conceptual understanding and the quality of their arguments, respectively. The analysis of covariance results indicate that argumentation practices significantly improved conceptual understanding of the experimental group when compared to the control group. Furthermore, the results show that the pre-service teachers exposed to argumentative practices constructed more quality arguments than those in the control group after the instruction. Based on these results, it can be concluded that the instruction based on argumentative practices is effective in concept teaching in science education. Therefore, argumentation should be explicitly taught in teacher education besides elementary and secondary education.     

The Collaboration of Cooperative Learning and Conceptual Change: Enhancing the Students’ Understanding of Chemical Bonding Concepts

The main purpose of this study was to investigate the effects of cooperative learning based on conceptual change approach instruction on ninth-grade students’ understanding in chemical bonding concepts compared to traditional instruction. Seventy-two ninth-grade students from two intact chemistry classes taught by the same teacher in a public high school participated in the study. The classes were randomly assigned as the experimental and control group. The control group (N?=?35) was taught by traditional instruction while the experimental group (N?=?37) was taught cooperative learning based on conceptual change approach instruction. Chemical Bonding Concept Test (CBCT) was used as pre- and post-test to define students’ understanding of chemical bonding concepts. After treatment, students’ interviews were conducted to observe more information about their responses. Moreover, students from experimental groups were interviewed to obtain information about students’ perceptions on cooperative work experiences. The results from ANCOVA showed that cooperative learning based on conceptual change approach instruction led to better acquisition of scientific conceptions related to chemical bonding concepts than traditional instruction. Interview results demonstrated that the students in the experimental group had better understanding and fewer misconceptions in chemical bonding concepts than those in the control group. Moreover, interviews about treatment indicated that this treatment helped students’ learning and increased their learning motivation and their social skills.     

Evaluating the Effectiveness of Integrating Food Science Lessons in High School Biology Curriculum in Comparison to High School Chemistry Curriculum

Historically, high school chemistry has been the predominate venue for the introduction of food science curriculum to students. With the current decline in chemistry as a required course for graduation, the possibility of exposure to food science in high school could equally decline. The purpose of this research was to determine if high school students in a biology class without a chemistry background could comprehend eight basic food science principles equally as well as students in a chemistry class that were taught the same principles. This study assessed baseline knowledge of high school students, determined the effect of food science‐based lessons on baseline knowledge and level of understanding, and determined the effect of food science‐based lessons on students’ awareness of and interest in food science. Baseline knowledge and awareness of food science was low. Food science‐based instruction resulted in higher posttest scores. Results indicated no differences in students’ knowledge base and level of understanding between biology and chemistry classes and supported the idea of further incorporating a food science curriculum into high school biology.     

Do Human‐Figure Drawings of Children and Adolescents Mirror their Cognitive Style and Self‐Esteem?

The investigation probed relationships among human‐figure drawing, field‐dependent‐independent cognitive style and self‐esteem of 10–15 year olds. It also attempted to predict human‐figure drawing scores of participants based on their field‐dependence‐independence and self‐esteem. Area, stratified and multi‐stage random sampling were used to select a sample of 600 10–15 year olds residing in Kolkata city, India. The sample comprised three age‐based strata: 10 and 11 year olds; 12 and 13 year olds; and 14 and 15 year olds. Each stratum comprised 100 girls and 100 boys. Participants’ actual age‐ranges were 10 years 1 month – 11 years 10 months (first stratum); 12 years 4 months – 13 years 10 months (second stratum); and 14 years 3 months – 15 years 9 months (third stratum). Goodenough‐Harris Drawing Test, Group Embedded Figures Test and Coopersmith Inventory were administered for assessing participants’ human‐figure drawing, field‐dependence‐independence and self‐esteem respectively. Results revealed significant positive relations among pertinent variables. Participants’ human‐figure drawing scores could be significantly predicted by their field‐dependence‐independence and self‐esteem.     

Effectiveness of Conceptual Change Text-oriented Instruction on Students’ Understanding of Energy in Chemical Reactions

The aim of this study is to compare the effectiveness of conceptual change text instruction (CCT) in the context of energy in chemical reactions. The subjects of the study were 60, 10th grade students at a high school, who were in two different classes and taught by the same teacher. One of the classes was randomly selected as the experimental group in which CCT instruction was applied, and the other as the control group in which traditional teaching method was used. The data were obtained through the use of Energy Concept Test (ECT), the Attitude Scale towards Chemistry (ASC) and Science Process Skill Test (SPST). In order to find out the effect of the conceptual change text on students’ learning of energy concept, independent sample t-tests, ANCOVA (analysis of covariance) and ANOVA (analysis of variance) were used. Results revealed that there was a statistically significant mean difference between the experimental and control group in terms of students’ ECT total mean scores; however, there was no statistically significant difference between the experimental and control group in terms of students’ attitude towards chemistry. These findings suggest that conceptual change text instruction enhances the understanding and achievement.     

IMPACT OF INTERACTIVE MULTIMEDIA MODULE WITH PEDAGOGICAL AGENTS ON STUDENTS’ UNDERSTANDING AND MOTIVATION IN THE LEARNING OF ELECTROCHEMISTRY

The Electrochemistry topic is found to be difficult to learn due to its abstract concepts involving macroscopic, microscopic, and symbolic representation levels. Studies have shown that animation and simulation using information and communication technology (ICT) can help students to visualize and hence enhance their understanding in learning abstract chemistry topics. As a result, an interactive multimedia module with the pedagogical agent (IMMPA) named the EC Lab (Electrochemistry Lab) was developed in order to assist students in the learning of Electrochemistry topics. A non-equivalent pretest–posttest control group design investigation was carried out in order to gauge the effect of the IMMPA EC Lab on students’ understanding and motivation in the learning of Electrochemistry. Some 127 Form Four students from two secondary schools in one of the districts in Malaysia were involved in the study. Each school had one treatment group and one control group taught by the same Chemistry teacher. Instruments involved were a pre- and posttest, a pre- and post-motivation questionnaire, and the IMMPA EC Lab. Results showed a significant difference between the control groups and treatment groups in the understanding of concepts in the learning of Electrochemistry.     

Accelerating the development of formal thinking in middle and high school students

In an attempt to accelerate the development of formal operations in average young adolescents, intervention lessons relating to all formal schemata were designed in the context of school science courses. Over a period of two years, up to 30 intervention lessons were given by science teachers to their classes in eight schools. Boys who started the program aged 12+ showed a pre-posttest effect size on Piagetian tests of 0.89 SD compared with control classes. In terms of British norms for the development of operational thinking this was a mean change from the 51st to the 74th percentile. Neither the middle school students nor the 12+ girls showed greater gain than the controls. Gains were shown by girls in one 11+ class and in the two 11+ laboratory classes. In the laboratory school students given intervention lessons by the researchers maintained their gains over controls in formal operations at a delayed posttest one year after cessation of the program. There was no effect on tests of science achievement during the intervention. It was argued that the interventions needed to be accompanied by in-service training designed to enable teachers to change their teaching style in line with their students' increased operational thinking capacity.     

Drawing and the Aestheticisation of the Human Figure by Four‐ to Ten‐Year‐Old Botswana Children: Implications for Pedagogy

Drawing is one of children's modes of communication which has recently excited academic inquiry in non‐Western cultures. It is the means through which children express their fears, desires, anxieties and conception of phenomena. This study investigated drawings by four‐ to ten‐year‐old Botswana children in response to the human figure as an aesthetic object. The methodology involved observing a sample of forty purposively selected children engaged in the drawing process and analysing their visual productions in addition to conversational talk about their art. The study found that the human figure was the dominant aesthetic subject across ages represented in both conventionalised form and personalised imagery. Older children showed interest in culture specific imagery and demonstrated mastery of occlusion and depth cues, while four‐year‐old children had limited spatial awareness. The study also found that children demonstrated gradual improvement of drawing skills with age. There was no significant difference in drawing competence between sexes. Pedagogical implications are suggested to scaffold children through the stages of art development.     

Using the Science Writing Heuristic Approach to Enhance Student Understanding in Chemical Change and Mixture

This study investigated the effect of the Science Writing Heuristic (SWH) approach on grade 9 students’ understanding of chemical change and mixture concepts. Four intact classes taught by two chemistry teachers from a Turkish public high school were selected for the study; one class was assigned as the treatment group, and the other class was assigned as the comparison group. Students in the treatment group were instructed by the SWH approach, while those in the comparison group were instructed with traditionally designed chemistry instruction. Tests measuring students’ conceptual understanding in the units of chemical change and mixture were administered as pre- and posttest for both groups. At the end of the instruction, semistructured interviews were conducted with 13 students from the treatment group and eight students from the comparison group. ANCOVA results revealed that the SWH approach was superior to the traditional approach on students’ understanding of chemical change and mixture concepts. Interview results indicated that students in the treatment group demonstrated better scientific understanding of chemical change and mixture concepts compared to those in the comparison group.     

Exploring the Value Added of a Guided,Silent Reading Intervention: Effects on Struggling Third-Grade Readers’ Achievement

ABSTRACT

The authors’ purpose was to explore the effects of a supplementary, guided, silent reading intervention with 80 struggling third-grade readers who were retained at grade level as a result of poor performance on the reading portion of a criterion referenced state assessment. The students were distributed in 11 elementary schools in a large, urban school district in the state of Florida. A matched, quasi-experimental design was constructed using propensity scores for this study. Students in the guided, silent reading intervention, Reading Plus, evidenced higher, statistically significant mean scores on the Florida Comprehensive Assessment Test criterion assessment measure of reading at posttest. The effect size, favoring the guided, silent reading intervention group was large, 1 full standard deviation, when comparing the 2 comparison groups’ mean posttest scores. As such, the results indicate a large advantage for providing struggling third-grade readers guided silent reading fluency practice in a computer-based practice environment. No significant difference was found between the treatment and control group on the Stanford Achievement Test–10 (SAT-10) posttest scores, although posttest scores for the treatment group trended higher than the control. After conducting a power analysis, it was determined that the sample size (n = 80) was too small to provide sufficient statistical power to detect a difference in third-grade students’ SAT-10 scores.     

An inquiry approach to science and language teaching

The purpose of this study was to determine the effectiveness of an inquiry approach to science and language teaching to further develop classification and oral communication skills of bilingual Mexican American third graders. A random sample consisting of 64 subjects was selected for experimental and control groups from a population of 120 bilingual Mexican American third graders. The Solomon Four-Group experimental design was employed. Pre- and posttesting was performed by use of the Goldstein-Sheerer Object Sorting Test, (GSOST) and the Test of Oral Communication Skills, (TOCS). The experimental group participated in a sequential series of science lessons which required manipulation of objects, exploration, peer interaction, and teacher-pupil interaction. The children made observations and comparisons of familiar objects and then grouped them on the basis of perceived and inferred attributes. Children worked individually and in small groups. Analysis of variance procedures was used on the posttest scores to determine if there was a significant improvement in classification and oral communication skills in the experimental group. The results on the posttest scores indicated a significant improvement at the 0.01 level for the experimental group in both classification and oral communication skills. It was concluded that participation in the science inquiry lessons facilitated the development of classification and oral communication skills of bilingual children.