Start by drawing a large tree on a whiteboard or butcher paper or printing a graphic image of a tree as a large format poster. Thick limbs represent major areas of functionality within your system. The inside of the tree contains leaves that represent features in the current release. Leaves that are placed at the outer edge of the canopy represent new features. The edge of the tree represents the future. Write potential new features on several index cards, ideally shaped as leaves. Ask your customers to place desired features around the tree, shaping its growth. Do they structure a tree that is growing in a balanced manner? Does one branch, perhaps a core feature of the product, get the bulk of the growth? Does an underutilized aspect of the tree become stronger? We know that the roots of a tree (your support and customer care infrastructure) need to extend at least as far as its canopy. Do yours?