What should software practitioners know for adopting product line software engineering?

Software productline engineering is becoming recognized as an important concept for efficient and timely software development. But to be actually useful, practitioners of software development (designers, programmers, testers, etc.) must have solid understanding and well organized knowledge about productline engineering. So in this workshop, I want to discuss about; what kind of knowledge and skills do we need? How can we gain such knowledge and skills? Software architecture, programming techniques, and development tools are important ones.