3.4.1 The supply chain model
At the heart of the DSS is the model of the supply chain. The models used in computer-based analytical systems are mathematical models and this is simply the formula or equation representing the physical system (McLeod 1995). Mathematical models can describe the relationships among the various elements within a system with precision and modern computers allow us analyse these relationships with comparative ease.
However, in spite of the appreciable power of modern computers, it is usually difficult for the decision support system to model a supply chain. Let's look at some of the relevant problem areas:
- the complexity of the network design problem
- the problem of dealing with location and allocation
- the complexity of the functional trade offs involved in logistics
- the existence of complex and ill defined cost relationships
- the need to understand the complete system behaviour before making changes
- the risks and capital investment typically involved in any implementation.
Chapter 2 in your text covers the DSS-based design methodology quite extensively. Read the text thoroughly for a clear understanding. In short, the DSS-based network design configuration is based on the following methodology:
- Build an extensive database with quality data for all relevant elements of the supply chain.
- Build a model of a logistics network with appropriate solution technique.
- Validate the data and model against current configuration.
- Seek decision support guidance from the DSS.