We need to go to external sources to determine the customer’s name, the central office servicing the line, the distance from the central office, and so on. Once we have a complete message with all relevant data, we can decide what package to offer to the customer. In this scenario, the decision is postponed until the end, so we can use a Routing Slip to collect the necessary information. We need to assess, though, whether we really require the flexibility of the Routing Slip. Otherwise, a simple hard-wired chain of Pipes and Filters (70) may be sufficient.
