Generic examples: Seeing the general in the particular

This paper explores some of the ambiguities inherent in the notions of generality and genericity, drawing parallels between natural language and mathematics, and thereby obliquely attacking the entrenched view that mathematics is unambiguous. Alternative ways of construing 2N, for example, suggest approaches to some of the difficulties which students find with an algebraic representation of generality. Examples are given to show that confusion of levels is widespread throughout mathematics, but that the very confusion is a source of richness of meaning.     

Measuring poly-victimization using the Juvenile Victimization Questionnaire

OBJECTIVE: Children who experience multiple victimizations (referred to in this paper as poly-victims) need to be identified because they are at particularly high risk of additional victimization and traumatic psychological effects. This paper compares alternative ways of identifying such children using questions from the Juvenile Victimization Questionnaire (JVQ). METHODS: The JVQ was administered in a national random digit dial telephone survey about the experiences of 2,030 children. The victimizations of children 10-17 years old were assessed through youth self-report on the JVQ and the victimizations of children 2-9 assessed through JVQ caregiver proxy report. RESULTS: Twenty-two percent of the children in this sample had experienced four or more different kinds of victimizations in separate incidents (what we term poly-victimization) within the previous year. Such poly-victimization was highly associated with traumatic symptomatology. Several ways of identifying poly-victims with the JVQ produced roughly equivalent results: a simple count using the 34 victimizations screeners, a count using a reduced set of only 12 screeners, and the original poly-victimization measure using follow-up questions to identify victimizations occurring during different episodes. CONCLUSION: Researchers and clinicians should be taking steps to identify poly-victims within the populations with which they work and have several alternative ways of doing so.     

Learning and using science ideas when doing investigate‐and‐redesign tasks: A study of naive,novice, and expert designers doing constrained and scaffolded design work

This study reports on what naive, novice, and expert designers do and learn when investigating simple mechanical devices and then planning their redesign. Participating in the study were 32 high school and adult subjects who did two investigate‐and‐redesign (I&R) tasks. Same gender pairs of subjects with similar design experiences explored, analyzed, and evaluated different brands of a device, designed experiments to compare them, and then proposed their redesign. Each two‐hour session was videotaped, and portions were analyzed using methods adapted from protocol analysis techniques. Results suggest that when naive designers do I&R tasks, their learning is highly contextualized and device‐specific. Naive designers made few connections from their work to key science ideas, and instead used mechanical advantage preconceptions that they did not spontaneously redress during the I&R sequence. Experts made connections to concepts and cases, inferred key design decisions, and sought “critical design problems” for the devices studied. All groups used strategies involving analysis more than those involving synthesis or evaluation. Notably, during conceptual design, opportunities for using science, present especially when subjects analyze design ideas, went underutilized by nonexpert designers. Scaffolded questions are needed to focus the learning of science embedded in design‐oriented activities. All findings reported are tentative, given the limited number of cases included in this study. © 2001 John Wiley & Sons, Inc. J Res Sci Teach 38: 791–820, 2001     

The POE in the primary school: An evaluation

The POE (Predict-Observe-Explain) is a technique for identifying students' knowledge and understanding of science concepts. It has mainly been used for physical science topics at secondary and tertiary levels. In the present study, 60 preservice teachers each implemented and evaluated POEs with groups of primary children. The children were studying a range of topics from the NSW Science and Technology K-6 Syllabus and represented a range of year levels. The evaluations were generally positive. The children responded to the technique enthusiastically and the teachers were able to identify both their understandings and their process skills development. The main problems were the difficulty of inventing suitable POEs in some topics, especially topics on communication, and problems caused by the use of oral rather than written responses. The study concluded that it is a suitable technique for primary science.     

Keeping Students Out of Mary’s (Class)room

Science & Education - Whilst many science educators, it is reported, associate knowledge with justified true belief (JTB), epistemologists have observed that the JTB model is an incomplete...     

Do parents make a difference to children’s academic achievement? Differences between parents of higher and lower achieving students

Differences in family factors in determining academic achievement were investigated by testing 432 parents in nine independent, coeducational Melbourne schools. Schools were ranked and categorized into three groups (high, medium and low), based on student achievement (ENTER) scores in their final year of secondary school and school improvement indexes. Parents completed a questionnaire investigating their attitudes towards the school environment, their aspirations, expectations, encouragement and interest in their child’s education (adapted from scales constructed by Marjoribanks). They also responded to six open‐ended questions on their attitudes to achievement and to their (child’s) school. Multiple regression analyses revealed that parental expectations of their children’s educational level made the strongest unique prediction of high achievement followed by the length of time they had maintained their expectations. Limitations discussed include the disparity in meaning associated with the definition of school success and whether these results can be generalized to all students considering the biased sample (socio‐economic status).     

Questioning Established Histories: Light from Dark Quarters

My purpose in this paper is to look at the work of a number of scholars who have challenged popular and mainstream accounts of Western and pre‐Colombian American history and to assess the implications of their work to art education. There are three of these scholars whose works are pivotal. They are: Cheik Anta Diop, Ivan Van Sertima, and Martin Bernal. What is the substance of their challenge? They assert that Ancient Egypt was an African civilization, whose achievements in science, philosophy, and the arts exerted a powerful formative influence on the ancient world of Greece and pre‐Columbian Middle America. This has been misrepresented in popular and mainstream European accounts of world history. The implications of their work for art education are considerable, especially to art history as it relates to multicultural issues. Indications are that we must move beyond the cultural chauvinisms that persist in texts and curriculum structures if we are to achieve truly democratic situations and these revisionist historians help us to do just that.     

Gardnerella vaginalis infection and sexual contact in female children

Gardnerella vaginalis (GV) infection has been reported as being acquired via sexual contact in adults and as an indicator of sexual contact in female children (DeJong, 1985). The purpose of this study was to determine if GV infection was more commonly found in 191 female children who gave a history of sexual contact and/or were infected with Neisseria gonorrhoeae (GC) or Chlamydia trachomatis (CT) (Group 1), compared with 144 female children evaluated for possible sexual abuse and found to have no such history or infection with GC or CT (Group 2), or 31 female children (friends of the authors) without such a history or GC or CT infection (Group 3). Vaginal GV was found in 5.3% of Group 1, 4.9% of Group 2 and 6.4% of Group 3 (p > .05). Also, vaginal GV infection was not related to the type of sexual contact or race, but did increase with age in white female children. Because vaginal GV infection is not more commonly found in children with a history of sexual contact than those without such a history, the finding of GV in a vaginal culture in an individual case would not be a reliable marker of sexual contact. Routine culturing for GV is not recommended as part of a sexual abuse workup.