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|can be extremely eective, but is still a black art. Our work can be viewed as a step towards providing a more solid foundation for it, taking advantage of the availability of large relevant databases. Categories and Subject Descriptors H.2.8 [Database Management]: Database Applications| data mining

We discuss the legacy and processes of creative design, and differentiate it from the type of user-centered design commonly found in CHI. We provide an example of this process, and discuss how design practice constitutes an essential mode of inquiry. We argue the complementary nature of creative design and user-centered design practices. Syncretic disciplines shift and drift from their original practice. A key issue is how CHI is to respond to changes in acceptable design practice. A key contribution of this work is an illustrative example showing how designers can communicate their intellectual rigor to the CHI community.

Abstract—Peering in the Internet interdomain network has long been considered a “black art”, understood in-depth only by a select few peering experts while the majority of the net-work operator community only scratches the surface employing conventional rules-of-thumb to form peering links through

Computational workflows have recently emerged as an effective paradigm to manage large-scale distributed scientific computations. Workflow systems can automate many executionlevel details and provide assistance in composing and validating workflows. However, there is still a significant effort involved in creating these workflows since they often represent collaborative and exploratory science experiments. Therefore, current practice is effective in producing results but not cost-effective for widespread adoption. Drawing from our previous research in computational workflows across scientific disciplines, this paper analyzes the tasks and overall process for designing these workflows. We discuss software engineering methodologies and their relevance to creating workflows as a unique kind of software artifact. We also discuss our ongoing work to make workflow applications more cost effective and lower the barriers for widespread adoption of workflow technologies.

The history, definitions, and transdisciplinary extent of pseudoreplication, as well as some key concepts of experimental design, are briefly reviewed. Pseudoreplication, sometimes also referred to as the ‘unit of analysis error, ’ is one of the commonest errors of statistical analysis and interpretation. It is a simple albeit serious one. It persists in part because of the failure of statisticians and scientists to develop a clear, consistent terminology for the concepts of statistics, experimental design, and sampling design that is used across all disciplines, as well as a terminology for specific categories of the more common errors. Lack of a clear terminology, in turn, has fostered narrow, discipline-specific jargon, inconsistency among textbooks and reference works, and ineffective teaching. Reform of terminology is possible, and great improvement in statistical practice would follow.

Abstract. Each year a wealth of informatics olympiads are held worldwide at national, regional and international levels, all of which require engaging and challenging tasks that have not been seen before. Nevertheless, creating high quality tasks can be a difficult and time-consuming process. In this paper we explore some of the different techniques that problem setters can use to find new ideas for tasks and refine these ideas into problems suitable for an informatics olympiad. These techniques are illustrated through concrete examples from a variety of contests. Key words: programming contests, task creation. 1.

bioremediation of crude oil contaminated soils study was carried out in engineered laboratory biopile systems. In soil bioremediation, biopiles are ‘ex situ ’ treatment systems that consist of excavated and aerated contaminated soils amended by addition of biological, mineral or organic material depending upon specific needs. When bac-teria are added to the contaminated soil undergoing biological treatment, the latter is referred to as a bioaugmented treatment system. Such soils are arranged above ground in a pile fashion and hence the term biopile. The study has shown virtually identical trends in respiration rates when indigenous and commercial added bacteria where employed. However, the bioaugmen-ted experiments yielded much greater respiration rates and lead to a reduction of 75 % of the initial oil in just 118 days, compared to 1 year in similar studies in the literature. The benefits of engineered biopile systems include safe operations, facilitated material balance and process controllability. The benefits of bioaugmentation were clearly demonstrated and it was found that when no nutrients are added to the soil, bacteria tend to metabolize hydrocarbons into carbon dioxide and water rather than assimilate carbon in cell growth. Polyaromatics analysis of treated soil in this investigation pointed out that simpler and more bioavailable crude oil components were degraded first. A simple sigmoid model for the carbon dioxide generation was developed from the respiration data.

instrumentation and computational methods have increasingly assisted in this work and it is shown that friction materials have ceased to be developed by ‘black art ’ and are now a well understood science.

This position paper describes some preliminary fieldwork conducted within a medium-size `fax box' electronics company, to improve the group working of a team of software engineers engaged in embedded software production. We argue on the basis of our observations that, although the initial requirement was to investigate improvements in change control for a new product development, it quickly became apparent that, the issues of concern strongly characterized maintenance. In particular, the limited support for coordination between software engineers during software change. Although the deficiency was apparent on a day-to-day basis within the software organization, it came to the fore on the run-up to major system releases, and thus was increasingly identified as a problem area, which needed to be addressed. This was already being partially achieved by the introduction of a `source-code control system', which incorporated documentation features. However, circumvention of, and lack of suppo...