SPL

http://grandview.rymatech.com/2009/15-introduction-to-the-sei-framework-for-software-product-line-practice.html

http://grandview.rymatech.com/2009/16-software-product-lines-an-effective-business-and-development-strategy.html

http://grandview.rymatech.com/2010/30-exploring-product-line-opportunities.html

http://grandview.rymatech.com/2009/46-towards-compositional-software-product-lines.html

http://www.cs.helsinki.fi/u/vjkuusel/gradu/vanhat/Software%20Product%20Lines.pdf