How is Open Source affecting software development?

Paper describes impact of using open source software in general development environments. (From the intro): " The dynamism of open source software development efforts, numerous high-profile success stories, and the novel economic, business, and legal aspects of open source software adoption are justifiably creating a stir in the development community. We software practitioners increasingly face the possibility of using or basing our work on open source components, libraries, frameworks, systems, platforms, and development environments."