FORMALIZATION OF HILBERT'S GEOMETRY OF INCIDENCE AND PARALLELISM

Three things are presented: How Hilbert changed the original construction postulates of his geometry into existential axioms; In what sense he formalized geometry; How elementary geometry is formalized to present day's standards.     

Psychosocial work factors, physical work load and associated musculoskeletal symptoms among home care workers

This study was based on a questionnaire and included a group of home care workers (HCW) (n = 305) and a reference group of municipal employees (n = 694). The relationship between the work environment and musculoskeletal symptoms was analysed. The HCW were less satisfied with their control over their work and stimulus from their work and had a higher physical work load and prevalence of musculoskeletal symptoms, compared with the reference group. The Rate Ratio (RR) of neck and shoulder symptoms among HCW was 83 and 54 %, respectively, higher among those reporting a "high" psychological work load compared with those reporting a "low" load. The highest RR for a single risk indicator was 2.5, and this concerned low-back symptoms among HCW who often worked with twisted postures. A combination of "poor" psychosocial work environment and "high" physical work load produced the highest RR for work-related neck (RR = 2.57) and shoulder (RR = 2.13) symptoms.     

Cooperation,ethnic salience and generalization of interethnic attitudes

This study compared the effectiveness of three theoretically-based conditions of intergroup cooperation in bringing about generalization of ethnic outgroup attitudes from a cooperation partner to the outgroup as a whole. Twenty-seven pairs of Dutch secondary school pupils were assigned at random to work together in triads to solve two word puzzles. The triads consisted of one Turkish pupil, always a confederate, and two Dutch pupils. The three conditions varied according to whether reference was made to the ethnic background of the confederate in both an introductory conversation and in the conversation-break between puzzles (High–High salience); only in the later break (Low–High); or not at all (Low–Low). Results show no differences between conditions in attitudes towards the partner, which were quite positive. However, attitude change only generalized in the two conditions in which ethnic membership was made salient (Low–High and High–High, which did not differ). These findings are discussed in terms of different models of intergroup contact, and how contact may actually work.     

Bandura's theory of self-efficacy: A set of common sense theorems

Bandura's (1977) theory of self-efficacy is translated into non-technical language and is shown to consist of logically necessary rather than empirically testable statements. As an alternative to the dominant empiricist view, it is argued that valid theories in psychology are explications of conceptual relationship imbedded in ordinary language (common sense). This conceptual network is anterior to both observation and theorizing. The analogy between the tasks of pre-Euclidean geometry and contemporary psychology is explored. The tasks are seen as involving explication of our implicit concepts of respectively space and people. One consequence of the stated view is that much psychological research is pointless since it attempts to verify logically necessary statements by empirical methods.