Ships (ocean-going vessels, short-sea vessels, and inland barges) unload raw materials or load finished products. Each ship has five defining properties relevant to our model: § size (tonnage); § length (a distinction between long and short suffices); § product (each ship handles just one specific type of cargo); § (un)loading time (in hours); § priority (a distinction between high and low suffices). When a ship has arrived in the port, a suitable mooring point is selected according to a set of rules, which are discussed below. Table 1 shows all types of ships loading and unloading at the jetty along with their values for the aforementioned properties. For example, every year, a total of fourteen short vessels arrive carrying 4,000 tons of product B, with a loading time of 26 hours. Columns “Ships per year”, “Priority” and “Tons per year” are discussed in more detail later.