This paper describes a new modelling technique to visualise and assess the impact of EDI enabled process redesign options for a supply chain and its participants, both in terms of flexibility and costs. Flexibility is defined here as the ability to meet a wide variety of customer demand (versatility) in a short period of time (agility). The research claim is that supply chains and organisations are better capable of meeting a wide variety of demand, when EDI enabled process redesign options are implemented which both increase flexibility and reduce costs. Four applications of the new modelling technique, which is called the modular design approach, in the air cargo transportation industry support this claim