a collection of components from which a "kit" may be created for subsequent installation in the works. A "design system" may, for example, be presented in a supplier's catalogue, from which the purchaser/specifier may make a choice.
A "design system" may give rise to one or many different "kits" (i.e. construction products, defined below). A "design system" cannot be a construction product, because it is possible only to buy one "kit" at a time from the "system"; the "system" itself cannot be bought.
