One of the most prominent aspects of this paper that stands out is the stacked arrangement (in layers) of the language itself. It also gives a reasonably descriptive overview of each aspect of the language (and each layer), and I think serves as a primer on the development of similar languages. By breaking down the system into five different layers, it provides a way for readers to understand the language better. it will be interesting to see the applicability of existing parallel programming software systems to the patterns specified by this language.
The authors have clearly defined the roles played by different kinds of programmers, and from my own personal experience I find this to be a very accurate representation. Even though I am only now being to work in parallel software systems I can relate to the roles played by parallel software developers especially about the handling of concurrency issues and also the load balancing(between processors) aspect of parallel programming. I feel that application development(on existing software systems) is one of the main reasons for the growth of parallel programming and the authors have given enough focus to this aspect in the paper. Overall OPL caters to the needs of different types of programmers (not restricted to parallel programming), and also accounts for system changes thus making this a somewhat flexible pattern language.
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