Children’s concept of probability as inferred from their binary choices—revisited

Children had to choose one of two urns—each comprising beads of winning and losing colours—from which to draw a winning bead. Three experiments, aimed at diagnosing rules of choice and designed without confounding possible rules with each other, were conducted. The level of arithmetic difficulty of the trials was controlled so as not to distort the effects of the constituent variables of proportion. Children aged 4 to 11 first chose by more winning elements and proceeded with age to choices by greater proportion of winning elements. There were some indications of intermediate choices by fewer losing elements and by greater difference between the two colours. Distinguishing correct choices from favourable draws, namely acknowledging the role of chance in producing the outcome and insisting on the right choice, grew with age. Children switched rather early from considering one dimension to two; they combined the quantities of winning and losing elements either additively by difference or, with age, mostly multiplicatively by proportion. Guided playful activities for young children, based on this research, are suggested for fostering acquisition of the basic constituents of the probability concept: uncertainty of outcome, quantification by proportion, and the reverse relation between the chances of complementary events.     

What contributes to teaching assistant development: differential responses to key design features

Graduate Teaching Assistants (TAs) need effective, appropriate professional development opportunities that offer both meaningful foundations and strategically useful tools for their teaching. This study examined and explored the perceptions of TAs with regard to the nature, content, and design characteristics of training and development for teaching in the research university. A group of 210 graduate teaching assistants at a research university reported their perceptions of a range of design elements of training sessions and activities. TAs perceived that training contributed to their learning and development, promoting skills and strategies helpful for their teaching. More focused, strategic sessions received higher overall scores than more general foundational sessions, though strategic sessions were grounded in the more foundational ones. Design features that TAs reported most significantly contributed to their development were: expertise of speakers, structural design of events, and quality of support materials. Eighty percent of TAs reported intentions to continue learning about instructional theory and practice. Findings include consistency with some previous research-based principles of training and development, but also raise new questions regarding TAs’ needs and how to address them.     

Material characterization,stratigraphy, textures,and painting techniques of the mural painting The Allegory of the Industrial Development of São Paulo by Fulvio Pennacchi

ABSTRACT

This work presents a study of samples of the mural painting The Allegory of the Industrial Development of São Paulo (Alegoria ao Desenvolvimento Industrial Paulista), made in the city of São Paulo, Brazil, by the artist Fulvio Pennacchi. Using transmitted light petrographic microscopy, scanning electron microscopy coupled with energy dispersive X-ray spectrometry, and X-ray fluorescence, the stratigraphy, the textures, the mineralogy, and the chemical compositions of the mural were established; therefore the painting techniques, pigments, and materials applied by the artist were identified. The mural was painted with the fresco technique and variations. This technique involves the use of materials of mineral origin, both in the support and for the pigments. About the artist’s relevance, Fulvio Pennacchi is considered an important muralist of his time, being one of the pioneers in the production of frescoes in Brazil. The mural, measuring approximately 11?×?6?m, painted in 1954, was removed from where it was originally made, in consequence of a fire that affected the place. Specialized engineers transported it, and today it is stored awaiting restoration. The data presented here can support the process of restoration of the mural, as well as contribute to the improvement of protocols for the analysis of works of art, and to the historical record of mural painting techniques over time.     

Communicating spirit in a collaborative alliance

This case study identified communicative practices that supported “collaborative spirit”; in a collaborative alliance. Two components of collaborative spirit previously identified in the literature were examined: shared mission and shared power. Communication practices associated with the shared mission principle included discussion of the mission, reaffirmation, testimony, and pride statements. Communication practices associated with the shared power principle included use of a consent process, barter and negotiating behavior, provision of equal opportunity, soliciting others’ input, and the rotating chairperson.     

Communicating Prevention: The Effects of the keepin’ it REAL Classroom Videotapes and Televised PSAs on Middle-School Students’ Substance Use

This study sought to determine if exposure to two communication-oriented activities, videotapes and public service announcements, accounts for changes in substance use among adolescents participating in the Drug Resistance Strategies Project's keepin’ it REAL adolescent substance use prevention curriculum. Middle-school students (4,734, 72% Latino) responded to questionnaires related to these analyses. An analysis of covariance (ANCOVA) model was fit separately to six substance use outcomes. The results suggested that intervention students who saw four or five videos engaged in less substance use in the past month than did students who saw fewer videos. Having seen the PSAs one or more times did not predict the reported change in substance use.     

Teacher Access and Mentoring Abilities: Predicting the Outcome Value of Extra Class Communication

Reasoning from Sunnafrank's theory of predicted outcome value (POV), this investigation examined how students' assessments of their teachers' accessibility and mentoring abilities influenced their perceptions of the predicted value of engaging in extra class communication (ECC). Student perceptions of teacher physical and social accessibility, along with teacher mentoring abilities (including career, course, and psychosocial), were all substantially and positively related to students' ratings of the POV of ECC. However, only social accessibility, course mentoring, and career mentoring emerged as significant predictors of POV in the regression model. These findings validate POV theory by confirming that students readily assess what they have to gain (or lose) from potential ECC encounters based on what their teachers can offer them. These findings are discussed with regard to understanding how students may be motivated to realize the benefits of ECC.     

Teacher educators' reflections on moments in a secondary teacher education course: thinking forward by challenging our teaching practices

In this paper the authors explore two pedagogical moments that occurred within a diversity‐focused secondary teacher education course, giving specific attention to Genevieve's and Debra's reflections as course instructors. We explore the ways in which instructors find themselves challenged, engaged and provoked to rethink taken for granted ideas and beliefs about their pedagogies as teacher educators. We conclude the paper by ‘thinking forward’: challenging teacher educators to be responsible and to be vulnerable with respect to their own teaching stances and to take the time to critically examine their own lived experiences in order to connect with their students' emergent understandings.     

A Western perspective on inclusion in Chinese urban educational settings

During the past 20 years in China a higher priority has been given to overcoming barriers to learning by educators. Legislation in the mid-1980s to establish compulsory school attendence has brought many children and young people into school for the first time. Chinese policy makers have also responded to international debates on the values of inclusive education. Over the past twelve years I have observed significant changes in educational provision, particularly in the cities. In this paper I describe and discuss a series of lessons I saw in Shanghai primary schools and, putting my comments in the context of practice in the UK, I ask to what extent do developments in China represent a move towards greater inclusion. Obstacles remain in both countries.