1. A method for defining a form navigational structure associated with a node in a process flow, the method comprising: selecting a node form for the node in the process flow, the node form identifying a plurality of first displayable forms included within a ticket, the ticket being routed through the process flow from the node to another node, wherein the node comprises a location in the routing of the ticket that receives human intervention in the process flow; defining a plurality of node steps for the node, the node steps corresponding to displayable screens associated with subsets of the first displayable forms; and establishing a hierarchical tree structure associating the plurality of node steps, wherein: branches in the hierarchical tree structure have associated validation rules, and the associated validation rules define a navigational flow through the node steps of the hierarchical tree structure.