By this term of our own making, we simply mean the following: now that we have played with different UseCaseRealization s, and have a pretty good idea of which objects are going to interact, having which responsabilities, we are ready to gather together the objects in different layers (persistence, presentation, business logic (control)). We are also ready to group together some of the objects into object hierarchies, or structures ressembling already existing components. At the same time at which we can apply web application and other patterns others or we ourselves have already used.
If we do that, we will be effectuating a kind of hook-up, between the freewheeling objects which emerge naturally from our realization exercises, on the one hand, and already existing patterns, components, on the various functional layers we are used to dealing with.