Encoding using Py*

Py* is a programatic approach to encode models represented using the i* model. Most of the large models are encoded in visio(.vsd) format. It can be viewed in any version of visio or using libre office. Libre office is free for all operating systems.

Here is how a small model is represented using i*

The equivalent py* encoding can be seen in this file

Representing Nodes and Edges

• All nodes are represented as classes with the first parameter as "Content of the node" and the second parameter as its container/agent/actor which is optional.
• Edges are represented as type of the edge as class name with the first parameter as "source" and the second parameter as "target".
• Edges between containers and nodes need not be encoded.
• Dependency edge is represented against the general convention of how we view edges. For eg. in the fig above. "Provide to firemen" is the source and "Cross related information" is the target.