Using business process modeling within Drupal

I found modules that enable me to implement workflow processes for single Drupal-nodes. What I want to do is to integrate several nodes (whatever they might be) into one comprehensive process and link those nodes to certain activities in the process flow.
2 answers

Using the Maestro Module

A very promising module is being developed at the moment - Maestro ( It serves the purpose of developing a complex workflow on a Drupal platform very well. Unfortunately it's only available for Drupal 7.x, which might be a problem if the goal is to integrate it into a system that runs on an earlier version of Drupal.


Using MS Visio for modeling

As described in this thread: it is possible to model the business process in a program like MS Visio and use Hyperlinks to connect the different nodes in the model to pages in Drupal.