Statistical Certification of Software Systems

Common software release procedures based on statistical techniques try to optimize the trade-off between further testing costs and costs due to remaining errors. We propose new software release procedures where the aim is to certify with a certain confidence level that the software does not contain errors. The underlying model is a discrete time model similar to the geometric Moranda model. The decisions are based on a mix of classical and Bayesian approaches to sequential testing and do not require any assumption on the initial number of errors.     

Analysis of the spread of Rhynchophorus ferrugineus in an urban area,using GIS techniques: a study case in Central Italy

Urban Ecosystems - The spread of the red palm weevil is now a very severe problem on a global scale. In this paper, we investigate its spread during the 2007–2013 period in a coastal urban...     

Contested Terrain of the Global Fisheries: “Dolphin-Safe” Tuna,The Panama Declaration,and the Marine Stewardship Council1

ABSTRACT The globalization of socio-economic relations is a central topic of discussion in both the general literature on economy and society and in the area of food and agriculture. Many maintain that we are in a transition from one era, termed Fordism, to another, called Global Post-Fordism. We use the case of two fisheries eco-labeling programs to inform discussions regarding the emergence of stabilizing socio-economic mechanisms in the Global Post-Fordist era. We argue that recent developments in the tuna-dolphin case, the first major experiment with eco-labeling in the fisheries industries, combined with the Marine Stewardship Council, an initiative designed to regulate and certify a system of global “sustainable fisheries” through an eco-labeling program, provide valuable insights into the ideological and organizational structure of salient global actors in the Post-Fordist era. The discussion addresses (1) the contested terrain within the “North” and between the “North” and the “South” regarding eco-legislation to regulate the global fisheries; (2) the fracturing of the environmental movement into “mainstream” and “grassroots” camps and the resulting inability to maintain a coordinated agenda to counter the globalization project; and (3) the emergence of new forms of supranational state-like regulatory mechanisms that combine science with free trade and environmental ideals and propose to resolve the global fisheries crises by providing sustainable socio-economic coordination. We conclude that the emergence of these supra-national state-like NGOs raises important implications for the sovereignty of nation-states and democratic action on the part of subordinate groups opposed to the globalization project.     

Human mobility in the context of environmental and climate change: Recent data collection tools from the International Organization for Migration to address key methodological and conceptual issues

This paper outlines recent data collection tools and methodologies that the International Organization for Migration (IOM) has been using in order to gather information on human mobility as influenced by environmental factors and their impacts. It looks at alternative ways for collecting and analysing data in the face of methodological challenges related to the multicausality of movements, the voluntary/involuntary continuum in human (im)mobility decisions in the context of environmental and climate change, and the policy and epistemological imperative from viewing migration as an adaptation strategy. The paper finds that certain data collection approaches can be quickly deployed in rapid-onset disasters as well as applied in contexts of gradual, slow-onset environmental change to provide information useful for operational responses to immediate crises and/or for developing policies in response. Some of the tools can be useful in both contexts and may support both immediate and long-term operational, policy and research objectives.     

POLICY WITH DISPERSED INFORMATION

Information regarding economic fundamentals is widely dispersed in society, is only imperfectly aggregated through prices or other indicators of aggregate activity, and cannot be centralized by the government or any other institution. In this paper we seek to identify policies that can improve the decentralized use of such dispersed information without requiring the government to observe this information. We show that this can be achieved by appropriately designing the contingency of taxation on ex post public information regarding the realized fundamentals and aggregate activity. When information is common (as in the Ramsey literature) or when agents have private information only about idiosyncratic shocks (as in the Mirrlees literature), the contingency on fundamentals alone suffices for efficiency. When instead agents have private information about aggregate shocks, the contingency on aggregate activity is crucial. An appropriate combination of the two contingencies permits the government to: (i) dampen the impact of noise and hence reduce non-fundamental volatility, without also dampening the impact of fundamentals; (ii) induce agents to internalize informational externalities, and hence improve the speed of social learning; (iii) restore a certain form of constrained efficiency in the decentralized use of information; and (iv) guarantee that welfare increases with the provision of any additional information. (JEL: C72, D62, D82)     

The sovereign crisis and Italy’s potential output

We evaluate the effects of the European sovereign crisis on Italian potential output (natural output, in the absence of nominal rigidities) by simulating a New Keynesian model. Our results are as follows. First, the 2011–2013 recession subtracted 1.6 percentage points from potential output growth and widened the output gap. Second, the 2013 reforms limited the reduction in output capacity to 1.4 points and enhanced long-run growth by 3. Third, once a balanced budget is achieved in the medium term, reductions in either labor or capital income taxes would boost potential output growth by 0.2 points per year.     

Firm internationalization and performance: Evidence for designing policies

The debate on the relationship between internationalization and performance is still open and is a hot topic for policymakers, but they ignore the impacts for most of the firms supported. The paper is based on a large database of seven years that considers quantitative-qualitative and control variables. To reduce industry and country heterogeneity we focused on the Italian automotive supply chain. We tested 5 modes of internationalization on firms’ profitability so to support the design of policies. Our results are partially in contrast with literature; therefore we identify specific environments where policies, namely for exporting, could be more effective.     

Making Boards Effective: An Empirical Examination of Board Task Performance

Despite the increasing attention of management scholars to boards of directors, there is still scant evidence on the antecedents of board task performance. The lack of significant results seems to be due to some theoretical and methodological choices followed by scholars, i.e. the almost exclusive reliance on agency theory and the use of demographic data. Following the call for dismantling the fortresses dominating past studies, this paper contributes to opening the 'black box' of boards of directors, developing a conceptual model that considers the impact of board members' diversity, commitment and critical debate on board task effectiveness in performing its service and control tasks. We collected primary data through a questionnaire survey, and we tested the model controlling for board, firm and industry characteristics. Our findings suggest that (i) the predictors we identified, and particularly the board members' commitment, are far more important than board demographics to predict board task performance; (ii) firm and industry contexts exert a significant influence on board task performance; (iii) predictors have a different impact on specific sets of tasks. Thus, our findings support the idea that several board characteristics and contingencies at both industry and firm level must be acknowledged in board design.