Before revision: A system sequence diagram should specify and show the following: External actors Messages (methods) invoked by these actors Return values (if any) associated with previous messages Indication of any loops or iteration area Reading a system sequence diagram Professionals, in developing a project, often use system sequence diagrams to illustrate how certain tasks are done between users and the system.
After revision: so I loveyouA system sequence diagram should specify and show the following: External actors Messages (methods) invoked by these actors Return values (if any) associated with previous messages Indication of any loops or iteration area Reading a system sequence diagram Professionals, in developing a project, often use system sequence diagrams to illustrate how certain tasks are done between users and the system.