High-Dimensional Software Engineering Data and Feature Selection

Software metrics collected during project development play a critical role in software quality assurance. A software practitioner is very keen on learning which software metrics to focus on for software quality prediction. While a concise set of software metrics is often desired, a typical project collects a very large number of metrics. Minimal attention has been devoted to finding the minimum set of software metrics that have the same predictive capability as a larger set of metrics – we strive to answer that question in this paper. We present a comprehensive comparison between seven commonly-used filter-based feature ranking techniques (FRT) and our proposed hybrid feature selection (HFS) technique. Our case study consists of a very highdimensional (42 software attributes) software measurement data set obtained from a large telecommunications system. The empirical analysis indicates that HFS performs better than FRT; however, the Kolmogorov-Smirnov feature ranking technique demonstrates competitive performance. For the telecommunications system, it is found that only 10% of the software attributes are sufficient for effective software quality prediction

A Second Replicated Quantitative Analysis of Fault Distributions in Complex Software Systems

Background. Software engineering is in search for general principles that apply across contexts, for example to help guide software quality assurance. Fenton and Ohlsson presented such observations on fault distributions, which have been replicated once. Objectives.We intend to replicate their study a second time in a new environment. Method.We conducted a close replication, collecting defect data from five consecutive releases of a large software system in the telecommunications domain, and conducted the same analysis as in the original study. Results. The replication confirms results on un-evenly distributed faults over modules, and that fault proneness distribution persist over test phases. Size measures are not useful as predictors of fault proneness, while fault densities are of the same order of magnitude across releases and contexts. Conclusions. This replication confirms that the un-even distribution of defects motivates un-even distribution of quality assurance efforts, although predictors for such distribution of efforts are not sufficiently precise

Telecommunications Network Planning and Maintenance

Telecommunications network operators are on a constant challenge to provide new services which require ubiquitous broadband access. In an attempt to do so, they are faced with many problems such as the network coverage or providing the guaranteed Quality of Service (QoS). Network planning is a multi-objective optimization problem which involves clustering the area of interest by minimizing a cost function which includes relevant parameters, such as installation cost, distance between user and base station, supported traffic, quality of received signal, etc. On the other hand, service assurance deals with the disorders that occur in hardware or software of the managed network. This paper presents a large number of multicriteria techniques that have been developed to deal with different kinds of problems regarding network planning and service assurance. The state of the art presented will help the reader to develop a broader understanding of the problems in the domain

Iowa Communications Network Performance Report, FY2007

Agency Performance Repor

Rámec pro posouzení kvalitativních hledisek informačních systémů

Záměrem předložené disertační práce je porozumět tomu, jak investoři v konkrétním společenském kontextu vnímají význam kvality informačních systémů. Ze studia literatury zabývající se přístupy a rámci hodnocení kvality informačních systémů vyplývá, že tato kvalita je obecně hodnocena z hlediska striktního přístupu. V této práci je ukázáno, že kvalitu informačního systému lze smysluplně pochopit použitím interpretačního paradigmatu a že kvalita informačního systému je definována společensky a ovlivňována kontextem tohoto systému. Studie byla zahájena průzkumem dvaceti libyjských organizací. Podrobnější data byla získána z případové studie dvou vybraných libyjských organizací působících ve veřejném sektoru. Při empirické analýze nashromážděných dat bylo využito rámce mnohočetné perspektivy, který zahrnuje hlediska teorie strukturalizace, pojem mnohočetných perspektiv a metodologii měkkých systémů. V práci se dospělo ke zjištění, že: a) kvalita informačních systémů je pojata šíře, než je tomu u tradiční definice kvality, b) mnohočetné perspektivy kvality informačních systémů jsou ovlivněny opakovanou interakcí mezi investorem a institucionálními vlastnostmi kontextu informačního systému a že c) rozdílné hodnoty v kulturním prostředí a vnějším kontextu ovlivňují rozsah působnosti investora a interakce v kontextu informačního systému. Ze závěru práce vyplývá, že společenská skladba mnohočetných perspektiv kvality informačního systému je ovlivněna strukturalizačními procesy mezi investory a vlastnostmi v kontextu informačního systému.This thesis is concerned with understanding how stakeholders in a particular cultural context construct the multiple meanings of ‘Information Systems Quality’ (IS Quality). A review of literature on approaches and frameworks for IS quality shows that the IS quality is generally examined through a ‘hard approach’. This study demonstrates that IS quality can be meaningfully understood through an interpretive paradigm, and that IS quality is socially constructed and influenced by the IS context. The study began with an exploratory survey of twenty Libyan organizations. Data were gathered through a case study of two public sector organizations in Libya. A Multiple Perspective Framework (MPF) that incorporates ideas from structuration theory, multiple perspectives concept, and soft systems methodology (SSM) was used to analyze the empirical work. The findings revealed that: (a) IS quality is a broader conception than the traditional quality definition, (b) the multiple perspectives of IS quality are influenced by repeated interaction between the stakeholder and institutional properties in the IS context, and (c) mediation of different values in the culture system and in the external context influence the extent of stakeholder agency and interaction in the IS context. The study concluded that the social construction of multiple perspectives of IS quality is influenced by the structuration processes between stakeholders and properties in the IS context.

Designing Open and Distance Learning for Teacher Education in Sub-Saharan Africa: A toolkit for educators and planners

Everyone remembers a good teacher. Good teachers are the key to educational expansion and improvement. In many countries in Sub-Saharan Africa, there is an urgent need to expand the number of primary and secondary teachers. In all African countries, there is an equally important need to improve the quality of teaching. To achieve this, it is clear that new approaches to teacher education are essential. Existing institutions of teacher education will continue to play an important role, but, alone, they will not meet the goals of Education for All (EFA) by 2015. It is fortunate that, just as the twin needs to improve the quantity and quality of teachers become imperative, so new forms of education and training are becoming available. The world is witnessing a revolution in information and communication technologies (ICTs), which can offer training and support of a type and at a cost hitherto impossible to consider, and thus, must be fully explored given the scale and urgency of demand. In doing so, however, it will be necessary to build on existing and well-tested strategies, including the best models of open and distance learning. This toolkit is the third in a series of recent publications by the Africa Region Human Development Department of the World Bank to share knowledge and experience on how distance education and ICTs can support education in Sub-Saharan Africa. It emphasizes the rigorous process by which new forms of distance-education programs for teacher education can be planned and implemented. The best models of established programs are considered along with the potential for incorporating, as the means become available, new modes of communication. Most forms of teacher education, particularly those concerned with qualification upgrading and ongoing professional development, will have to be based in schools. The authors demonstrate how school-based programs, appropriately resourced and supported, have the potential not only to raise significantly the number and quality of teachers, but also to improve classroom practice and school organization, generally. The guidance and advice, which is drawn from many years of experience in design and implementation, and embraces a range of case studies from across the region, will be of considerable value to those preparing new policies and programs of teacher education and to those seeking to improve existing programs

"Regulating Healthcare Technologies and Medical Supplies: A Comparative Overview"

A complex relationship exists among EU regulations, current national practices and rules, institutional capacities to implement regulatory adjustments and the legacy of past health and regulatory policy and traditions. However, there is little empirical information on medical devices policy, the medical devices industry, and the assurance of medical device safety and usage. Drawing on a review of the secondary literature and on-going field work, the evidence suggests that the current mix of statecentric and self-regulatory traditions will be as important in determining the implementation and final outcomes of EU-rules as the new rules themselves. EU directives redesign rules, but they do not necessarily lead to institutional change, create institutional capacities, or alter old practices in the short term. Neither EU directives nor national regulatory adjustments determine the "man-machine/skill-experience" interface which is shaped and influenced by local medical traditions and the acceptance of these traditions by local publics