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The rapidly developed Information and Communication Technology (ICT) products have made great contributions in various application areas. However, the related problems in the consumption of household ICT appliances are crucial to economy, environment and society. As concluded from literature review of practice, assessment and legislation, there is obvious lack of information and understanding of the household consumption pattern of the ICT appliance in a more systematic “life-cycle thinking” approach – from purchase, usage to end-of-life, in environmental-social- economic three dimensional perspective. This deficiency could lead to ineffective policy programmes and implementation.
This exploratory study tentatively develops a measurement and benchmarking method, named as Sustainable Consumption Index (SCIndex) model, aiming at improving knowledge and holistic understanding of consumption patterns of household ICT appliances along the value chain in global or regional consumers’ households. This dissertation accomplishes the preliminary design of the SCIndex model and its pilot application with a global Internet survey on consumer behavior for detailed analysis, such as, cross-cultural comparison, three stages analysis (purchase, usage and end-of- life), and total SCIndex score benchmarking and analysis.
This study identified that overall consumption patterns of household ICT appliances in the developed countries are not necessarily more sustainable than in the developing countries, if all the stages of consumption are overviewed. The findings contribute to the gaps in knowledge of underlying behavioral factors that influence sustainable consumption of household ICT appliances entirely or in any stage; furthermore, they sketch out the national profiles and improvable aspects on the path of more sustainable consumption. The SCIndex model and pilot application stress the importance and provide empirical evidence to support concrete modelling with a multifaceted approach in measurement and benchmarking of household ICT appliances’ life-cycle consumption for “going beyond GDP”. The model is suggested to be optimized in sampling, design and structure, data analysis methods and the implementation.
To efficiently promote sustainable consumption of the household ICT appliances, the pilot application provides further recommendations to the engaged stakeholders that include: i) sufficiency in purchase; ii) efficient usage; iii) responsible disposal; iv) smooth channels for reuse; v) further in-depth researches and projects.
Software visualization is a field of software engineering which aims at providing visual representations of software systems or particular aspects thereof. Numerous approaches for the visualization of software systems have been developed during the last decades. Software cities denote one particular kind of software visualizations that adopts the city metaphor for depicting software systems as virtual cities. Due to their high expressiveness and effectiveness software cities are mainly used for program comprehension tasks, during reverse engineering, and in quality analysis scenarios. Software systems evolve. They are steadily enhanced to provide new product functions, corrected to fix defects, or adapted to changed system environments. Software cities, as proposed today, do not take this evolutionary character of software systems into account. The evolution of software systems, i.e. changes to their internal structure and other characteristics, can easily disrupt the overall software city structure and thus yield very inconsistent visualizations for evolving software systems. The interpretation of these evolving software cities may be error-prone and time-consuming. In this thesis we propose a new software city approach that is based on the observation that real cities often reveal their evolution insofar as they contain e.g. historic centers or satellite cities. Analogous patterns, however, cannot be found in software cities which is an astonishing divergence. We claim that by preserving historical structures and carefully expanding software cities during software evolution, i.e. by spatializing software evolution, we obtain highly expressive, effective, and consistent software cities which support a broader range of application scenarios than the current state of the field. The main contribution of this thesis is a new layout approach for software cities, which explicitly takes evolution into account. Its effects are twofold: First, evolution becomes directly visible in the software city structure in the form of specific geographic patterns that each depicts particular evolutionary phenomena. The resulting increased expressiveness allows for supporting new application scenarios which are evaluated for several example systems. Second, software evolution does no longer disrupt the overall software city structure. Instead, the software cities evolve smoothly during system evolution, which allows for using them during ongoing system development and maintenance. The high consistency of this approach is confirmed in an empirical evaluation.