An Empirical Comparison of Reuse in Embedded and Nonembedded Systems

High-quality software, delivered on time and budget, constitutes a critical part of most products and services in modern society. Our government has invested billions of dollars to develop software assets, often to redevelop the same capability many times. Recognizing the waste involved in redeveloping these assets, in 1992 the Department of Defense issued the Software Reuse Initiative. The vision of the Software Reuse Initiative was "To drive the DoD software community from its current "re-invent the software" cycle to a process-driven, domain-specific, architecture-centric, library-based way of constructing software.'' Twenty years after issuing this initiative, there is evidence of this vision beginning to be realized in nonembedded systems. However, virtually every large embedded system undertaken has incurred large cost and schedule overruns. Investigations into the root cause of these overruns implicates reuse. Why are we seeing improvements in the outcomes of these large scale nonembedded systems and worse outcomes in embedded systems? This question is the foundation for this research. The experiences of the Aerospace industry have led to a number of questions about reuse and how the industry is employing reuse in embedded systems. For example, does reuse in embedded systems yield the same outcomes as in nonembedded systems? Are the outcomes positive? If the outcomes are different, it may indicate that embedded systems should not use data from nonembedded systems for estimation. Are embedded systems using the same development approaches as nonembedded systems? Does the development approach make a difference? If embedded systems develop software differently from nonembedded systems, it may mean that the same processes do not apply to both types of systems. What about the reuse of different artifacts? Perhaps there are certain artifacts that, when reused, contribute more or are more difficult to use in embedded systems. Finally, what are the success factors and obstacles to reuse? Are they the same in embedded systems as in nonembedded systems? The research in this dissertation is comprised of a series of empirical studies using professionals in the aerospace and defense industry as its subjects. The main focus has been to investigate the reuse practices of embedded systems professionals and nonembedded systems professionals and compare the methods and artifacts used against the outcomes. The research has followed a combined qualitative and quantitative design approach. The qualitative data were collected by surveying software and systems engineers, interviewing senior developers, and reading numerous documents and other studies. Quantitative data were derived from converting survey and interview respondents' answers into coding that could be counted and measured. From the search of existing empirical literature, we learned that reuse in embedded systems are in fact significantly different from nonembedded systems, particularly in effort in model based development approach and quality where the development approach was not specified. The questionnaire showed differences in the development approach used in embedded projects from nonembedded projects, in particular, embedded systems were significantly more likely to use a heritage/legacy development approach. There was also a difference in the artifacts used, with embedded systems more likely to reuse hardware, test products, and test clusters. Nearly all the projects reported using code, but the questionnaire showed that the reuse of code brought mixed results. One of the differences expressed by the respondents to the questionnaire was the difficulty in reuse of code for embedded systems when the platform changed. The semistructured interviews were performed to tell us why the phenomena in the review of literature and the questionnaire were observed. We asked respected industry professionals, such as senior fellows, fellows and distinguished members of technical staff, about their experiences with reuse. We learned that many embedded systems used heritage/legacy development approaches because their systems had been around for many years, before models and modeling tools became available. We learned that reuse of code is beneficial primarily when the code does not require modification, but, especially in embedded systems, once it has to be changed, reuse of code yields few benefits. Finally, while platform independence is a goal for many in nonembedded systems, it is certainly not a goal for the embedded systems professionals and in many cases it is a detriment. However, both embedded and nonembedded systems professionals endorsed the idea of platform standardization. Finally, we conclude that while reuse in embedded systems and nonembedded systems is different today, they are converging. As heritage embedded systems are phased out, models become more robust and platforms are standardized, reuse in embedded systems will become more like nonembedded systems.

Transgender Group Therapy: Process and Issues with Male to Female Clients

Transgender issues are garnering more attention within the mental health field. With the increased social awareness of transgender issues, the mental health field is recognizing the need for effective psychological services for this population. Transgender individuals face unique challenges related to gender non-conformity, the coming-out and transitioning processes, and in society at large, all of which can lead to a number mental health concerns. Group therapy is a promising treatment modality for transgender individuals. The purpose of this paper is to offer a rationale for the effectiveness of group therapy, and recommendations for best practices utilizing the current literature and my experience with facilitating a Male to Female transgender therapy group.

Developing an Analytical Framework on Social Cohesion in Singapore. Reflections from the framing of social cohesion debates in the OECD and Europe. EU Centre Singapore Working Paper No. 17, November 2013

Official discourse in Singapore on social cohesion is often framed along the broad parameters of achieving racial and religious harmony. Many policies – formal and informal – and several laws evolved to manage these two aspects of society. Yet, as Singapore developed and with a much more complex socioeconomic environment both domestically and externally, there is perhaps a need to re-look the discourse and framework for discussing social cohesion. This paper takes a critical look at how the issue of social cohesion is framed in academic literature and policy discussions in Europe and the OECD, and tries to develop a broader analytical framework that could be useful in the Singapore context as it struggles with the multiple fault lines in society (beyond race and religion) that have emerged in the last decade or so.

The modern study of literature; an introduction to literary theory and interpretation by Richard Green Moulton ...

Introduction: Dominant ideas of modern study: unity, induction, evolution.--book I. Literary morphology: varieties of literature and their underlying principles.--book II. The field and scope of literary study.--book III. Literary evolution as reflected in the history of world literature.--book IV. Literary criticism: the traditional confusion and the modern reconstruction.--book V. Literature as a mode of philosophy.--book VI. Literature as a mode of art. Conclusion: the traditional and the modern study of literature. Syllabus. Works of the author. General index. Seventh impression, June, 1928

World Beats : Beat Generation Writing and the Worlding of U.S. Literature /

A study of the Beat-era writers in a global context. This title was made Open Access by libraries from around the world through Knowledge Unlatched.

Journal of Biblical literature.

Place of publication varies: Atlanta, GA, <1999->

Biological effects of neutrons, gamma radiation, and neutron-gamma combinations : a selective bibliography of unclassified literature /

An annotated bibliography of 190 items is presented, covering AEC report literature and selected references from the open literature on biological effects of neutrons, gamma radiations, and combinations of both.

Popular literature with reference to infidelity and public morality : a paper /

Cover title.

Advertising 1972. Hearings, Ninety-second Congress, second session, on S. 1461, to require the furnishing of documentation of claims concerning safety, performance, efficacy, characteristics, and comparative price of advertised products and services [and] S. 1753 amendment no. 1118 to establish a National Institute of Advertising, Marketing, Society. May 16, 18, and 31, 1972

"Serial no. 92-72."

Museum of foreign literature, science and art.

Edited at first by Robert Walsh, Jr. and then by Eliakim and Squier Littell, the monthly Museum of Foreign Literature, Science, and Art was the leading American eclectic for twenty years. Much of its contents were selected from British magazines; included were reviews, poetry, literary and scientific news, biographical sketches of British authors, lists of new British publications, and articles on literature. The engraved portraits in each number were a popular feature. After 1830, plates were published regularly, and the magazine began to devote a large proportion of its space to serial fiction by Dickens, Reade, Bulwer, Thackeray and other popular English novelists.

Our secret friends and foes : expanded from lectures delivered before popular audiences in London, Edinburgh, and elsewhere /

'Published under the direction of the General Literature Committee'.

An address delivered before the Peithessophian and Philoclean Societies of Rutgers College : on the literary character of the Scriptures /

"Delivered and published by request of the Peithessophian Society."

A familiar history of birds : their nature, habits, and instincts /

Includes index.

Two lectures on the advantages of a republican condition of society, for the promotion of the arts, and the cultivation of science /

Cover-title: The advantages of a republican state of society for the cultivation of the arts and sciences.

On the management and education of children:

Published under the directon of the Committee of Genral Literature and Education, appointed by the Society for Promoting Christian Knowledge.