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Done well, separation of concerns can provide many software engineering benefits, including reduced complexity, im-

Abstract. Process languages remain a vital area of software process research. Among the important issue for process languages are semantic richness, ease of use, appropriate abstractions, process composability, visualization, and support for multiple paradigms. The need to balance semantic richness with ease of use is particularly critical. JIL addresses these issues in a number of innovative w ays. It models processes in terms of steps with a rich v ariety o f semantic attributes. The JIL control model combines proactive and reactive c o n trol, conditional control, and more simple means of controlow modeling via step composition and execution constraints. JIL facilitates ease of use through semantic factoring, the accommodation of incomplete step speci cations, the fostering of simple sub-languages, and the ability to support visualizations. This approach allows processes to be programmed in a variety of terms, and to a variety o f levels of detail, according to the needs of particular processes, projects, and programmers.

Abstract. This paper indicates how effective software-process programming languages can lead to improved understandings of critical software processes, as well as improved process performance. In this paper we study the commonly mentioned, but seldom defined, rework process. We note that rework is generally understood to be a major software development activity, but note that it is poorly defined and understood. In this paper we use the vehicle of softwareprocess programming to elucidate the nature of this type of process. In doing so we demonstrate that an effective language (i.e. one incorporating appropriate semantic features) can help explain the nature of rework, and also raise hopes that this type of process can be expedited through execution of the defined process. The paper demonstrates the key role played in effective rework definition by such semantic features as procedure invocation, scoping, exception management, and resource management, which are commonly found in programming languages. A more ambitious program of research into the most useful processprogramming language semantic features is then suggested. The goal of this work is improved languages, for improved understandings of software processes, and improved support for software development.

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