3.1.Production Measure 
 These are the level of activity of the business. In the ports industry a number of different terms are used to represent this category such as 'trade', 'traffic', 'throughput' and 'output'. Traffic measures, which indicate in various ways the quantity of cargo passing through a port or terminal in unit time, and throughput measures, which indicate the effort involved in moving that cargo, in terms of tonnes handled or containers movements per unit of time. 
Throughput measures include: