Methodik und Ergebnisse einer Experimentreihe über Entwurfsmuster

Software-Entwurfsmuster sind eine intuitiv einleuchtende Idee, die viele Befürworter hat. Als Forscher dürfen wir die behaupteten Wirkungen von Entwurfsmustern jedoch nicht einfach glauben, sondern müssen sie gründlich prüfen. Dieser Artikel beschreibt die wichtigsten Behauptungen und entwickelt daraus zugeh?rige Forschungsfragen. Wir diskutieren die Methodik für ein Forschungsprogramm, das die Fragen beantworten soll, und skizzieren praktische Beschr?nkungen, unter denen diese Forschung ablaufen mu?. Es folgt eine kurze Beschreibung von drei kontrollierten Experimenten und den Hauptfolgerungen aus ihren Ergebnissen. So sollte man zum Beispiel die Benutzung von Entwurfsmustern in einem Entwurf genau dokumentieren und Entwurfsmuster nicht einsetzen, ohne alternative Entwürfe zu prüfen. Abschlie?end diskutieren wir ein im Rahmen des Forschungsprogramms geplantes viertes Experiment. Der Beitrag dieses Artikels liegt vorrangig in einer Beschreibung und Diskussion wichtiger methodischer Aspekte kontrollierter Experimente in der Softwaretechnik.     

Child Voice: How Immigrant Children Enlightened Their Teachers with a Camera

Changes in global patterns of residence mean that preschool teachers welcome immigrant children and families into preschools in increasing numbers. Many teachers report both anticipation and apprehension about having immigrant children in the classroom. Apprehension is related to concerns about a lack of enough knowledge about languages and cultures to sensitively work with children and families. To overcome apprehensions and challenges, teachers are encouraged to learn from the work of other adults. This study builds upon research that suggests that teachers can also look to the children as a source of knowledge. The purpose of this study was to explore how preschool immigrant children might use a disposable camera to communicate with their teachers. The participants of this qualitative study were immigrant and native-born students in a local preschool. Each child was given a disposable camera, instruction about taking photographs and the request to take pictures of what was important to them. Data were collected by recording each child telling the teacher about the pictures. Data were analyzed for themes, patterns and categories. Findings indicated that the messages that the children conveyed to their teachers included important information about language development and family cultural identity. Findings also identify teacher strategies that helped and hindered child ability to communicate during the photo-narration process. An implication of the study was a shift of child agency within the teacher child relationship during photo-narration activity.     

The crisis discourse of a wicked policy problem: vocational skills training in Australia

In 2007 the Rudd Labor government in Australia introduced significant changes to education policy for the nation. The Skilling Australia’s Future (Rudd et al. Skilling Australia for the future. Election 2007 policy document, 2007) policy was meant to redress a perceived failure by the previous Howard federal Liberal-National Coalition governments to fund and manage vocational skills training adequately. The Skilling Australia’s Future policy established a number of areas for immediate action. This paper looks at one of these areas from the policy document, namely, the Rudd government’s plan for addressing skills shortages (Rudd et al. 2007, pp. 4–9) through the establishment of Trade Training Centres in schools. The policy is analysed using Critical Discourse Analysis, featuring the semiotic concept of intertextuality. Findings from the application of this method suggest that Skilling Australia’s Future (2007) belongs within a history of like-minded policy and, although a new direction is provided by the allocation of Trade Training Centres to selected high schools, the policy is not clearly separable from the market-driven discourse that has pervaded education policy since the 1990s.     

The relationships between elementary students' knowledge-in-use performance and their science achievement

This longitudinal study examines the relationship between students' knowledge-in-use performance and their performance on third-party designed summative tests within a coherent and equitable learning environment. Focusing on third-grade students across three consecutive project-based learning (PBL) units aligned with the Next Generation Science Standards (NGSS), the study includes 1067 participants from 23 schools in a Great Lakes state. Two-level hierarchical linear modeling estimates the effects of post-unit assessments on end-of-year summative tests. Results indicate that post-unit assessment performances predict NGSS-aligned summative test performance. Students experiencing more PBL units demonstrate greater gains on the summative test, with predictions not favoring students from diverse backgrounds. This study underscores the importance of coherence, equity, and the PBL approach in promoting knowledge-in-use and science achievement. A systematically coherent PBL environment across multiple units facilitates the development of students' knowledge-in-use, highlighting the significance of designing science and engineering practices (SEPs) and crosscutting concepts coherently and progressively, with intentional revisitation of disciplinary core ideas (DCIs). The study also investigates how the PBL approach fosters equitable learning environments for diverse demographic groups, offering equitable opportunities through equity-oriented design. Contributions include a coherent assessment system that tracks and supports learning aligned with NGSS, emphasizing the predictive power of post-unit assessments, continuous monitoring and tracking. The implications of context similarity and optimal performance expectations within units are discussed. Findings inform educators, administrators, and policymakers about the benefits of NGSS-aligned PBL systems and the need for coherent and equitable learning and assessment systems supporting knowledge-in-use development and equitable opportunities for all learners.     

Digital approaches to researching learners’ computer interactions using gazes, actions, utterances and sketches

When learners use computers, they typically look at the screen, type, use the mouse, talk, write, sketch and make gestures. This paper identifies technical, practical, ethical and methodological challenges associated with traditional methods for studying such interactions. It examines the potential of recent technologies for identifying learners?? attention, recording real-time writing and sketching, and analyzing multiple data feeds in an integrated way. A study of learners?? interactions with multiple representations is used to illustrate the advantages and disadvantages of digital approaches to collecting, coordinating and analyzing observational data. The paper argues that there is a need for research into frameworks for analyzing digital data of learners?? computer interactions in systematic and principled ways.     

A Review of Empirical Literature on Inquiry Professional Development: Alignment with Best Practices and a Critique of the Findings

This review brings together the literature on inquiry-based teaching and learning and science teacher professional development (PD). We present a targeted critical review of research focused specifically on the nature of PD programs purported to emphasize inquiry. Our review analyzes the features of each program and critiques the reported outcomes of each study. Findings from this review suggest a general alignment with recommended features of effective PD as outlined in the literature with a few notable exceptions, including: supporting teachers in developing inquiry-based lesson plans, providing authentic inquiry experiences, and focusing on science content for teachers. More importantly, our review reveals that no reported study has connected participation in inquiry-based PD with all the desired outcomes of teacher PD: enhanced teacher knowledge, change in beliefs and practice, and enhanced student achievement. Implications for future research on inquiry-based PD programs are discussed.