If you are experienced user of RapidMiner or Knime, you will find our interface very familiar. We using Workflows - simple approach to represent Data Mining tasks as Directed acyclic graph. Programs which implemented Data Mining methods are part of the Workflow. User links programs in some order, to retrieve final and intermediate results of analysis.
Area for the current workflow takes a main part of the interface. To add new program to the workflow, you should drag it by mouse from the related widget. After that you can link it inputs with outputs of another workflow programs. You should drag by mouse from another program output to related input of the current program. Linked inputs and outputs should be equals by type, which marked by different colors.
You can call program configuration dialog by the related context menu element.