Authorization in workflows

Hello all

I'm making some research on authorization. I'm
describing RBAC to secure Web application, however,
sometimes web application have more granurar and
especial requierements. For example, in a Workflow,
authorization to perform an action is not only
dependant of user permissions but of worflow item
state (you cannot allow aproval on an item if it is
not complete even if the user is an approver).

So... my question is, do you know about a tool to
describe this in a document, something like a well
defined "workflow tree methodology" or similar.

Thank in advance,
Juan Carlos

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