The key to business success depends on the infusion of new ideas into the way products are brought to the marketplace. To achieve this delivery goal, today’s product development organizations must deliver a product line—a portfolio of similar products with variations in features and functions—rather than just one or more individual products. Software product line (SPL) management—or more precisely, systems and software product line engineering and delivery—is a new approach that helps organizations develop, deliver and evolve an entire product line portfolio, through each stage of the development lifecycle, with much higher degrees of efficiency than before.