Visual dataflow modelling (VDM) uses visual programming as a modelling technique for creating complex procedural design models. This paper compares three VDM systems, focusing on the cognitive stress associated with particular VDM constructs. The creation of iterative procedures is identified as a key area in VDM where cognitive stress tends to be high. Two iteration constructs are described, which are refer to as list-based iteration and node-based iteration. The research suggests that node-based iteration constructs have important advantages over list-based iteration constructs.
展开▼
