What role on a project is usually responsible for developing process models (swim lanes, activity diagrams, etc)? Is this a requirements analyst? Or is there typically a resource that is specifically a "process analyst or process modeler?"

Also, is it common practice in process modeling today to use BPMN? Or, do projects use various techniques for modeling processes?

Also, are people using formal process modeling tools for creating such models or are most of you using something simple like Visio?

Thanks!