This paper is motivated by two 'stylized facts' concerning the dynamics of diffusion of different technologies competing for the same market niche. a) A stable pattern of market sharing with no overwhelming dominant position is rarely observed in markets with network esternalities. Unbounded...

In this essay, the author assesses the operation of the Non-Compliance Procedure of the Montreal Protocol on Substances That Deplete the Ozone Layer. Although in operation for only six years, the Procedure and its standing Implementation Committee have already made significant contributions to...

The problem of water quality management under uncertain emission levels, reaction rates and pollutant transport is considered. Various performance measures: reliability, resiliency and vulnerability are taken into account. A general methodology for finding a cost-effective water quality...

All population projections are based in one form or another on expert judgement about likely future trends, structural continuity, etc. Although experts are clearly superior to lay people in their field of expertise, when it comes to forecasting they may make serious errors and can be as...

In 1997, the dynamic Family Microsimulation Model FAMSIM, a microsimulation model for projections and the evaluation of family policies - was developed at the Austrian Institute for Family Studies, in collaboration with IIASA. The purpose of the FAMSIM project was to demonstrate the feasibility...

In this paper, we consider the problem of incorporating additional preference information into Value Efficiency Analysis by using the "price" information of inputs and outputs. This is done to improve the accuracy of the estimation of the Value Efficiency Scores. Value Efficiency developed by...

The temporal dynamics of many populations involve intermittent rarity, that is, the alternation, over variable periods of time, of phases of extremely low abundance, and short outbreaks. In this paper we show that intermittent rarity can arise in simple community models as a result of...

An international group of scientists gathered in August 1996 for a workshop in the Matra mountains of Hungary to report and assess recent developments and open research topics in the new field of adaptive dynamics. This paper provides a brief overview of basic adaptive dynamics theory, outlines...