Strategien bei Raumvorstellungsaufgaben. Erste Ergebnisse einer Untersuchung mit Kindern im vierten Schuljahr

Aufgaben zum Erfassen räumlichen Vorstellungsvermögens werden traditionell bestimmte Lösungsstrategien zugeschrieben. Diese werden allerdings nicht zwangsläufig von Kindern eingesetzt. Erste Ergebnisse einer Interviewstudie zeigen, dass Kinder im vierten Schuljahr eine Vielzahl verschiedener Strategien einsetzen, deutlich mehr als die Theorie erwarten lässt. Diese Strategien gilt es zu analysieren, zu strukturieren und der Theorie gegenüberzustellen

A new chance for trade and investment

International investment flows have increased rapidly with the growing globalization of markets and production. These flows will be of greatest benefit to the world economy as a whole if they can be based on a transparent and predictable system of generally recognized rules. What strategy should the EU adopt to help create those rules? *** DIRECT SUPPORT *** A02GP103 0000

Female mating preferences in blind cave tetras Astyanax fasciatus (Characidae, Teleostei).

The Mexican tetra Astyanax fasciatus has evolved a variety of more or less color- and eyeless cave populations. Here we examined the evolution of the female preference for large male body size within different populations of this species, either surface- or cave-dwelling. Given the choice between visual cues from a large and a small male, females from the surface form as well as females from an eyed cave form showed a strong preference for large males. When only non-visual cues were presented in darkness, the surface females did not prefer either males. Among the six cave populations studied, females of the eyed cave form and females of one of the five eyeless cave populations showed a preference for large males. Apparently, not all cave populations of Astyanax have evolved non-visual mating preferences. We discuss the role of selection by benefits of non-visual mate choice for the evolution of non-visual mating preferences

Challenges on the way to stage three of European Monetary Union

While the Maastricht Treaty envisages a single European Currency as part of the Economic and Monetary Union, it contains no detailed instructions as to the practical arrangements for its introduction. Despite prolonged discussions and negotiations at various levels, no consensus has so far been achieved on the optimum changeover procedure. This article deals with some of the major challenges in this context