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Welcome to MSR 2011, the Eighth International Working Conference on Mining Software Repositories, held May 21-22 in Waikiki, Honolulu, Hawaii, and co-located with the 2011 ACM/IEEE International Conference on Software Engineering (ICSE 2011). This is the fourth year that MSR has been a Working Conference, building on the strong foundation of four years as a successful ICSE workshop. We are happy to report that the community of MSR researchers continues to grow, while at the same time the research being performed is maturing. This year saw a further increase in the total number of submissions: 61 full paper submissions (10 pages) and 17 short paper submissions (4 pages) for a total of 78. This total is 11 more than the 67 total submissions in 2010. Full paper submissions increased by 10 (61 vs. 51) while short paper submissions increased by 1 (17 vs. 16). Of the 61 full paper submissions, 20 were ultimately accepted, for a full paper accept rate of 33%. For short papers, of the 17 submissions 6 were accepted, for a short paper accept rate of 35%. Following last year's conference, MSR 2011 accepted or rejected papers at their submitted length, and did not permit downgrading of a paper from full paper to short paper. All accepted papers will be presented at the conference. Each paper received three reviews by members of the program committee. After we received all reviews, an online discussion process allowed variance among reviews to be understood, and in many cases, consensus to emerge. The program committee chairs then personally read all of the reviews and commentary prior to making final decisions. In the content of the papers, this year sees a continuation of previous topics, as well as the emergence of some new ones. Following MSR 2010, in MSR 2011, full papers receive a full 15 minutes for presentation within a block of papers within a session. In keeping with MSR's roots as a working conference, full paper sessions have 30 minutes for discussion of papers. For short papers, each paper has 7 minutes in a presentation session. The conference has two keynote presentations this year. Professor E. James Whitehead, at UC Santa Cruz in the USA, will present a talk entitled, Fantasy, Farms, and Freemium: What Game Data Mining Teaches Us About Retention, Conversion, and Virality; this talk will focus on computer games and opportunities for mining. Professor Yuanyuan Zhou, at UC San Diego in the USA, will present a talk entitled, Connecting Technology with Real?world Problems -- From Copy-paste Detection to Detecting Known Bugs; this talk will focus on her tech?transfer experiences from copy-paste detection to checking for known bugs. We are pleased to continue the tradition of the MSR challenge track, where researchers from across the community apply their mining techniques to a common problem. This year the main theme of the challenge is on comparison of projects. We selected four open source projects, and invited submissions to compare them and uncover interesting similarities and differences. The projects are Eclipse and Netbeans, two popular IDEs written in Java (Group 1) and Firefox and Chrome, two web browsers written in C/C++ (Group 2). Submissions were invited to analyze more than one project, ideally in the same group, or analyze a single project (4 page sub mission). The conference received 6 challenge track submissions, of which 5 were accepted and will be presented at the conference. We are also delighted to announce that a selection of the best papers from this year's conference will be invited to submit an extended version for consideration in a special issue of the Springer journal Empirical Software Engineering. The invitees will be announced during the opening session of MSR 2011. [ABSTRACT FROM AUTHOR]

Welcome to the Second International Workshop on Emerging Trends in Software Metrics (WETSoM 2011), held in Honolulu, Hawaii, as satellite workshop of the 33rd ACM/IEEE International Conference on Software Engineering (ICSE 2011). The workshop aims at gathering together researchers and practitioners to discuss the progress of software metrics. This year we received 26 papers by 70 unique authors from 14 countries. Every paper was reviewed by members of an international programme committee. We accepted 9 full papers (of 20 submitted) and 6 short papers (4 of the 6 submitted as short papers, and two long papers accepted as short papers). The program will feature technical sessions on (i) Software quality, (ii) Changes and defects, and (iii) challenges on software metrics, the latter followed by a working discussion on the topic. Last, but not least, we are honored to host a keynote by Professor Martin Shepperd, Brunel University, UK, on "Data Quality: Cinderella at the Software Metrics Ball". We would like to thank the authors and reviewers for their time and effort in providing a quality programme. Also, we would like to thank the ICSE 2011 organization for making this event possible, and the ICSE workshop chairs for proactively guiding us in the workshop organization process. [ABSTRACT FROM AUTHOR]

Welcome to the Second International Workshop on Managing Technical Debt, MTD 2011, co-located with the 33rd International Conference on Software Engineering at Waikiki, Honolulu, Hawaii! The first workshop on technical debt was held at the Software Engineering Institute in Pittsburgh on June 2 to 4, 2010 with the goal of understanding open research questions related to managing technical debt in software. The goal of this second workshop is to come up with a more in-depth understanding of technical debt, its definition(s), characteristics, its different forms. For this second workshop we accepted 3 research and 7 position papers. The papers were selected after a peer review by at least three members of the program committee. The accepted submissions cover a range of topics such as: monitoring and visualizing code quality, relationship of technical debt and maintainability, an economic model for technical debt and interest, software architecture related technical debt, and definitional foundations of technical debt. Managing technical debt is a broad concern of software engineering that blends research and practice. This can be seen from the programme and those involved in the workshop programme selection process. To encourage interactive discussion, foster brainstorming, community building the workshop will consist of only short presentations from the accepted papers. These short presentations will provide a basis for the participants to investigate further open research questions and challenges in practice. [ABSTRACT FROM AUTHOR]

This volume contains the proceedings of SESENA 2011, the second in a series of workshops devoted to software engineering for sensor network applications. The workshop took place in Waikiki (Honolulu, USA) on May 22nd, 2011 in conjunction with the International Conference on Software Engineering (ICSE). Its objective was to discuss current work and future directions in software engineering for sensor network applications. Wireless sensor networks (WSNs) are a fundamental building-block of the upcoming Internet of Things, as they enable seamless integration of the digital and physical worlds. These systems are composed of tiny devices that are inherently resource constrained. Their lifetime depends on the capacity of their batteries and their energy consumption. Memory is scarce and processing power is limited. Communication among nodes is typically unreliable and consumes a major part of the energy. Furthermore, WSN applications must run unattended and therefore self-organize. The development of WSN software is still carried out in a rather primitive fashion, by building software directly atop the operating system and by relying on the individual, hard-earned programming skills. These aspects make the development of WSNs a challenging task where multiple objectives need to be pursued at the same time. This possibly leads to failure of field deployments. In the WSN community there is a growing awareness of the need for methodologies, techniques, and abstractions to simplify the development task and increase the confidence in the correctness and performance of the software. Software engineering (SE) support is sought to ease the difficulty of sensor network development and to help produce more efficient and reliable application software. The aim of the SESENA workshop was to bring together the SE and WSN communities to jointly address these challenges. A synergy between these fields could advance both: by providing WSNs with the techniques currently missing, and by providing SE with an opportunity to face new challenges or rediscover old problems in a new context. The workshop was also intended to provide a discussion forum for software development and deployment for WSN applications, and aimed at the definition of a shared research agenda and the creation of a community around the subject area. The first edition of the SESENA workshop took place at ICSE 2010 in Capetown (South Africa), and laid the ground for the second edition. This year, papers presented during the technical sessions were selected from 21 submissions through a review process where at least three members of the program committee reviewed each paper. The workshop program included both full research contributions and short position statements. The workshop also featured discussion sessions and a "speakers' corner" session, composed by impromptu presentations where any of the attendees (including those without an accepted paper) were given a chance to present their own views in very short statements. [ABSTRACT FROM AUTHOR]