While keeping in mind appropriate caveats in extrapolating from these data, the prevalence rate of asymptomatic unruptured aneurysms found in the present study allows an estimation of the yearly rate of rupture of these lesions. The authors suggest that this yearly rate of rupture falls within the range of 1 to 2%.

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For many years distance education practitioners have enthusiastically embraced a wide range of educational technologies. In contrast, on-campus educators have tended to be satisfied with traditional approaches ignoring the new technologies of teaching and concentrating their energies on research and other scholarly activities. A review of developments in the application of a range of technologies in distance education provides an appropriate foundation for delineating the challenge to leaders and managers of conventional on-campus institutions interested in improving the quality of teaching and learning. The opportunity for institutional leaders is to adopt a proactive stance and to generate an organisational development strategy which will lead to the new technologies becoming a structurally integrated element of the teaching/learning environment. The tyranny of proximityIn the past twenty years, there has been a significant expansion in the availability of a wide range of technologies with the potential to improve the quality of teaching and learning in higher education. Apart from the more traditional technologies such as print, broadcast television and radio, the following new technologies provide opportunities for enhancing the quality of teaching: audiotapes, videotapes, computer-based learning packages, interactive video (disk and tape), CDTV, audio-teleconferencing, audiographic communication systems (eg Smart 2000) and video conferencing. In recent times these technologies have been supplemented by the advent of the opportunities for interactivity and access to instructional resources provided by the computer communications networks popularly referred to as the "Internet" or the "Information Super Highway". By and large, distance educators have embraced these new technologies, while the application of such technologies to conventional on-campus education has been primarily piecemeal and rather limited.

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This paper presents the results of a step-by-step Delphi analysis used to develop a definition and measure of quality of working life [QWL] in a case specific setting. A representative panel of 64 employees from the headquarters of a large insurance company constituted the Delphi panel that engaged in defining QWL utilizing a six-phase Delphi methodology. The results of a 34-item QWL questionnaire developed from that definition were tested with a sizable [n = 450] sample of the company's employees. Those results identified the following seven significant predictors of QWL, four of which extended beyond specific job content: [a] degree to which my superiors treat me with respect and have confidence in my abilities, [b] variety in my daily work routine, [c] challenge of my work, [d] my present work leads to good future work opportunities, [e] self-esteem, [/l extent to which my life outside of work affects my life at work, and [g] the extent to which the work I do contributes to society.

Although growth rate and age data are essential for leatherback management, estimates of these demographic parameters remain speculative due to the cryptic life history of this endangered species. Skeletochronological analysis of scleral ossicles obtained from 8 captive, known-age and 33 wild leatherbacks originating from the western North Atlantic was conducted to characterize the ossicles and the growth marks within them. Ages were accurately estimated for the known-age turtles, and their growth mark attributes were used to calibrate growth mark counts for the ossicles from wild specimens. Due to growth mark compaction and resorption, the number of marks visible at ossicle section tips was consistently and significantly greater than the number visible along the lateral edges, demonstrating that growth mark counts should be performed at the tips so that age is not underestimated. A correction factor protocol that incorporated the trajectory of early growth increments was used to estimate the number of missing marks in those ossicles exhibiting resorption, which was then added to the number of observed marks to obtain an age estimate for each turtle. A generalized smoothing spline model, von Bertalanffy growth curve, and size-at-age function were used to obtain estimates of age at maturity for leatherbacks in the western North Atlantic. Results of these analyses suggest that median age at maturation for leatherbacks in this part of the world may range from 24.5 to 29 yr. These age estimates are much greater than those proposed in previous studies and have significant implications for population management and recovery.