Seeing classes: toward a broadened research agenda for critical qualitative researchers

This paper proposes a research agenda that foregrounds social class in US public schooling. The author suggests that the relative invisibility of social class in academic discourse on schooling limits the value of research in at least three ways: (1) middle‐class academics’ propensity to speak on behalf of the poor and working class limits analysis of class and schooling; (2) the class and gender constraints on the work of teachers has been inadequately theorized, while simultaneously the work of teachers ha been invoked as proxy for deeper social and structural inequalities; and (3) researchers have declined to ‘study up’ power structures within which the work of schools is embedded, limiting our understanding of relationships between schooling and the economy. It is suggested that researchers’ work will make deeper contributions to the reform of schools to the extent that they acknowledge how norms of scholarship sustain their own middle‐class privilege.     

Dimensions of quality and accessibility: Selection of human information sources from a social capital perspective

This study focuses on how the accessibility and quality of co-workers in organizations affect their use as information source. Prior research has produced inconsistent findings concerning these factors’ respective influence on source selection. In this article, we argue that one potential reason for this lies in the lack of coherent definitions of accessibility and quality. To bridge this gap, we unpack these concepts into their underlying dimensions, based on insights derived from social capital theory, more specifically Nahapiet and Ghoshal’s (1998) contribution, to uncovering the multidimensionality of social capital. We empirically test the dimensionality of accessibility and quality, as well as the relative influence of these concepts on human information source selection, in a scenario experiment within an organization. Findings support the proposed dimensionality, and lead to the conclusion that both quality and accessibility influence the selection of human information sources, although quality exerts a slightly stronger influence.     

Query-oriented text summarization based on hypergraph transversals

The rise in the amount of textual resources available on the Internet has created the need for tools of automatic document summarization. The main challenges of query-oriented extractive summarization are (1) to identify the topics of the documents and (2) to recover query-relevant sentences of the documents that together cover these topics. Existing graph- or hypergraph-based summarizers use graph-based ranking algorithms to produce individual scores of relevance for the sentences. Hence, these systems fail to measure the topics jointly covered by the sentences forming the summary, which tends to produce redundant summaries. To address the issue of selecting non-redundant sentences jointly covering the main query-relevant topics of a corpus, we propose a new method using the powerful theory of hypergraph transversals. First, we introduce a new topic model based on the semantic clustering of terms in order to discover the topics present in a corpus. Second, these topics are modeled as the hyperedges of a hypergraph in which the nodes are the sentences. A summary is then produced by generating a transversal of nodes in the hypergraph. Algorithms based on the theory of submodular functions are proposed to generate the transversals and to build the summaries. The proposed summarizer outperforms existing graph- or hypergraph-based summarizers by at least 6% of ROUGE-SU4 F-measure on DUC 2007 dataset. It is moreover cheaper than existing hypergraph-based summarizers in terms of computational time complexity.     

Stimulating independent learning: a quasi‐experimental study on portfolio

A portfolio model was developed which can serve as an alternative to the literature study with practical processing, the predominant dissertation model used in teacher education courses in Flanders. Using a pre‐ and post‐test quasi‐experimental design with 174 teacher students and 44 supervisors, we examined whether the use of portfolio as a dissertation model has a greater effect on the students’ capacity for independent learning than the literature study with practical processing, using three questionnaires. The research shows that portfolio results in students acquiring greater metacognitive knowledge. It also appears that students only get the chance to use their metacognitive skills when supervisors give them sufficient autonomy. However, supervisors experience loss of control and therefore tend to restrict students’ autonomy. This leads us to the paradox of independent learning: students will only learn independently when they are given the opportunity to learn independently. Supervisors need to transfer learner control.