Validity and reliability of portfolio assessment in pre‐service teacher education

This article concentrates on the validity and reliability of portfolio assessment as used in pre‐service teacher education. It is not possible to make general pronouncements about the validity of portfolio assessment in pre‐service teacher education as there are multiple portfolio applications. The validity depends on the purpose, namely the divers competencies which the course organisers wish to assess with it. Therefore, three categories of competencies and consequently three types of portfolios were distinguished in order to determine the validity of portfolio assessment. For the assessment of teaching and partnership competencies, it is argued that the validity is low due to the roundabout nature of the assessment. On the contrary, the validity of portfolio assessment for learning competencies can be high. The execution of a self‐regulated learning process can be accurately assessed using portfolios. The reliability of portfolio assessment is problematic, since it is incapable of fulfilling the classic psychometric requirement of reliability. Nevertheless, provided that the necessary measures are taken, the reliability of portfolio assessment can still be brought to an acceptable level. Five measures are proposed.     

Estimating the quality of performance assessments: The case of an ‘interactive examination’ for teacher competencies

Professional schools prepare students to become competent professionals. Consequently, there is a need for assessments that can determine the acquisition of the relevant professional competencies. Although using performance assessment to replace traditional paper-and-pencil tests might provide one way to move forward, the use of performance assessments for summative purposes has been shown to be problematic (e.g. marker consistency and construct representation). With the aid of a comprehensive framework of quality criteria for competence assessments, this article considers if one particular existing competence assessment methodology is suitable for summative as well as formative use. It is argued that the comprehensive quality estimation of the examination procedure aids in identifying strengths and weaknesses in the assessment methodology, and that this information can be used to facilitate the inclusion of performance assessment in higher education, both for summative and formative use.     

The role of post-visit action resources in facilitating meaningful free-choice learning after a zoo visit

Places like zoos, where free-choice learning is encouraged, are important for conveying climate change and sustainability issues to the public. Free-choice learning that targets environmentally focused sustainable behavior changes must be meaningful in order to encourage actual behavior change post-visit. However, visitors often fail to translate their learning into behavior change after a visit. This research explores the role of post-visit action resources (PVARs) in facilitating long-term learning for individual environmental sustainability after a visit to the Leatherdale International Polar Bear Conservation Centre in Winnipeg’s Assiniboine Park Zoo in Manitoba, Canada. An embedded mixed-methods research design used personal meaning maps and follow-up interviews to measure free-choice learning; data were analyzed both quantitatively and qualitatively. Findings revealed that the PVARs positively affected free-choice learning after an on-site visit to the zoo. Recommendations and implications are discussed in relation to practical applications and implications for future research in environmental education.     

Anthropometric characteristics of elite female junior rowers

During the 1997 Federation Internationale des Sociétés d'Aviron (FISA) World Junior Rowing Championships, the anthropometric characteristics of 245 female junior rowers aged 17.5 +/- 0.8 years (mean +/- s) were assessed. Twenty-seven body dimensions (body mass, 6 heights or lengths, 4 breadths, 10 girths and 6 skinfolds) were measured in total. The elite female junior rowers were taller (174.5 +/- 6.2 cm) and heavier (69.5 +/- 6.2 kg), with greater length, breadth and girth dimensions, but lower skinfold thicknesses than a representative sample of Flemish (Belgian) girls of the same chronological age. An anthropometric profile chart was constructed that was rowing-specific and norms were established. Compared with scullers, sweep rowers were heavier (+4.2 kg) and taller (+2.8 cm), with greater length, breadth (except for femur width) and girth dimensions (except for calf girth). Sweep rowers also had greater skinfold thicknesses (except for the thigh and calf skinfolds). Finalists were heavier (+3.6 kg) and taller (+3.9 cm), with greater length, breadth (except for femur width) and girth dimensions (except for calf girth) than non-finalists. No significant differences were found for skinfold thicknesses between finalists and non-finalists.     

Competition,Concentration and Diversity in European Television Markets

This study investigates how competition, concentration and public broadcasters influence diversity of programme supply in European television markets. It focuses on free, national generalist channels; studies programmes as provided throughout the day; and tests hypotheses with data on Finland, France, Germany, Greece, Italy, the Netherlands, Spain and the U.K. for the late 1980s and 1990s. It concludes that competition is moderate in most markets. Under these conditions, competition and concentration contribute to a diverse supply of programmes that mirrors audience demand, while public broadcasters increase diversity of supply above competitive market levels.     

The roles of talent, physical precocity and practice in the development of soccer expertise

Here we consider the potential contributions of talent, physical precocity and deliberate practice in the development of soccer expertise. After presenting a working definition of 'talent', we examine how coaches perceive and select potential talent. Our findings suggest that much of what coaches see as early talent may be explained by physical precocity associated with a relative age advantage. Finally, as a test of the model of Deliberate Practice, we review the results of studies that assessed the progress of international, national and provincial players based on accumulated practice, amount of practice per week and relative importance and demands of various practice and everyday activities. A positive linear relationship was found between accumulated individual plus team practice and skill. Various practical suggestions can be made to improve talent detection and selection and to optimize career practice patterns in soccer.     

Influence of ski materials on muscle activity

The purpose of this study was to examine whether differences in construction between the compact ski, the racing ski and the soft ski influence the behavioural and electromuscular responses of the user. Eight qualified male ski instructors performed two 'shuss' trials and three different basic turns. Six muscles (M. biceps femoris, M. gastrocnemius lateralis and medialis, M. rectus femoris, M. vastus lateralis and M. tibialis anterior) were studied, using a conventional but portable electromyographic (EMG) registration with telemetric synchronization, active electrodes and a six-channel portable data recorder. Muscle contractions were continuously registered and visualized in raw EMG form and linear envelopes. The differences between the mean rectified EMG data of dynamic contractions while skiing and the mean rectified EMG data of the maximal voluntary contraction were used in the primary analysis of data, from which the participation levels of the muscles investigated could be calculated for each type of ski. Based on this comparison, differences between the effects on muscle activity of the three types of skis were unimportant. In a second phase, the normalized linear envelopes of all subjects were graphically superimposed and averaged. This was performed for each muscle, for each movement, for each leg and for each ski tested. The EMG data were considered in combination with anthropometric values, with snow characteristics and with the velocity of skiing. This study showed systematic differences between the use of the racing, soft and compact ski. On average the soft ski showed the lowest muscle activity patterns and thus the most economical muscular efforts for all muscles investigated and within all movements.