Qualitative and Qualitative Longitudinal Resources in Europe

In April 2009 the UK Timescapes Initiative, in collaboration with the University of Bremen, organised a residential workshop to explore the nature of qualitative (Q) and qualitative longitudinal (QL) research and resources across Europe. The workshop was hosted by the Archive for Life Course Research (Archiv für Lebenslaufforschung, ALLF) at Bremen and funded by Timescapes with support from CESSDA (The Council of European Social Science Data Archives, Preparatory Phase Project). It was attended by archivists and researchers from 14 countries, including ‘transitional’ states such as Belarus and Lithuania. The broad aim of the workshop was to map existing infrastructures for qualitative and QL data archiving among the participating countries, including the extent of archiving and the ethos of data sharing and re-use in different national contexts. The group also explored strategies to develop infrastructure and to support qualitative and QL research and resources, including collaborative research across Europe and beyond

Sharing Qualitative and Qualitative Longitudinal Data in the UK: Archiving Strategies and Development

Over the past two decades significant developments have occurred in the archiving of qualitative data in the UK. The first national archive for qualitative resources, Qualidata, was established in 1994. Since that time further scientific reviews have supported the expansion of data resources for qualitative and qualitative longitudinal (QL) research in the UK and fuelled the development of a new ethos of data sharing and re-use among qualitative researchers. These have included the Timescapes Study and Archive, an initiative funded from 2007 to scale up QL research and create a specialist resource of QL data for sharing and re-use. These trends are part of a wider movement to enhance the status of research data in all their diverse forms, inculcate an ethos of data sharing, and develop infrastructure to facilitate data discovery and re-use. In this paper we trace the history of these developments and provide an overview of data policy initiatives that have set out to advance data sharing in the UK. The paper reveals a mixed infrastructure for qualitative and QL data resources in the UK, and explores the value of this, along with the implications for managing and co-ordinating resources across a complex network. The paper concludes with some suggestions for developing this mixed infrastructure to further support data sharing and re-use in the UK and beyond

Algorithmic recognition of infinite cyclic extensions

We prove that one cannot algorithmically decide whether a finitely presented $\mathbb{Z}$-extension admits a finitely generated base group, and we use this fact to prove the undecidability of the BNS invariant. Furthermore, we show the equivalence between the isomorphism problem within the subclass of unique $\mathbb{Z}$-extensions, and the semi-conjugacy problem for deranged outer automorphisms.Comment: 24 page