Properties are not components that can be used to build systems . They are measures we use to characterise and evaluate systems by. Let us compare to a brick: the brick itself is an object we can use to build something with (e.g. a fireplace), its physical measures are properties we may use to select the particular type of brick and to plan the fireplace, but not to build with. Thus, properties are not components to be used in constructions, but means to understand, select and plan constructions.