Sharepoint Services 3.0: how to create authorization-documents-workflow between 3 level/subject?

Hello, is possible to create an authorization document workflow, I mean: Requestor (do request/fill the form) --> Responsible (accept/refuse the request) --> Operator (do the action described on requrest if accepted by Responsible)? -and- I'd like: Requestor can see his requests only; Responsible can see all requests done by his team group; Operator can see All requests. Many thanks!!!! Bye! Q

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