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This special collection of papers had its genesis at the IEEE Computer Society Workshop on Software Testing and Test Documentation held in Fort Lauderdale, Florida during December 18-20, 1978. This collection is devoted to selected papers on program testing that were presented at the Workshop. The thrust is towards approaches that can support the heuristic components of testing. There is increasing recognition that it is unlikely there will be a grand theory of testing which will lead to fully automated testing systems. Instead the tester will be called upon to use his intuition and problem-dependent knowledge in a discipline manner to test for a variety of specified error types. But it is crucial that this less ambitious, heuristic activity be nevertheless firmly embedded in an underlying framework which is logical, rigorous and well-understood.

Software pervades the growing web of computers and communications systems providing diverse services, personal, commercial, financial, public, and entertainment services. Providing timely, cost-effective, high-quality software for these diverse services requires the best possible technology and practice that the software engineering community can provide. The 1999 International Conference on Software Engineering (ICSE) was held in Los Angeles, California. Following the lead of previous ICSE conferences, the aim of ICSE held in the year 1999 was to bring together software engineering practitioners and researchers to present and discuss the most promising approaches for meeting the software challenges of the next century. The February 2001, issue of the journal IEEE Transactions on Software Engineering presents a special section with some of the best papers of the conference held in the year 1999. These papers were selected through an additional review process conducted after the conference. The ICSE '99 program committee selected a number of the best quality papers. The authors of these papers were invited to submit extended versions of their papers for consideration for journal publication.

The article discusses a ubiquitous computing (UbiSys) workshop held at Ubicomp 2006, the Eighth International Conference of Ubiquitous Computing. The conference was held in Orange County, California, September 17-21, 2006, and hosted by the University of California, Irvine, California. The workshop theme was pervasive image capturing and sharing. Participants used the Zone Tag camera phone application that uploads digital photos to Flickr. The wrap-up discussion revisited open questions including how to provide the most compelling image-sharing experience, and the convergence of image-sharing and social network software. Privacy issues were discussed.