The current technology gives little room for the different kinds of evolution needed for any software product line (SPL): evolution of the associated engineering environment, evolution of the market and SPL scope, evolution of the products and variability. The paper describes how these different evolution needs are addressed in the CADSE and Selecta systems. The solution we propose uses metamodeling and generation for the engineering environment evolution, composition for scope and market evolution, a component database and a selection language for the product and variability evolution. The paper presents the Selecta system and shortly discusses the experience.