This sequence diagram describes how a single business use case scenario is realized. It lives in a Business Use-Case Realization and shows how a purchase specification is
created in an organization.
The End User Manager actor starts the flow by having the Systems Specifications entity prepare the specification. This
indicates that there's a document or database that supports the operation Prepare system specification,
probably by allowing the document to be created. The End User Manager then uses the Update specification
operation to add information to the spec.
The sequence diagram also shows hierarchical operations. The IT Project Manager at one point requests that the Legal
Officer perform Supplement tender with legal terms. In order to fulfill that operation the Legal Officer must
do a contract search, make sure the legal language is valid, and supplement the specification with legalese.
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