How do I represent user input (for example, some information needed to create a new account) in a sequence diagram?
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That depends on what details you need to create the account. – Rohit Vipin Mathews Mar 27 '12 at 08:34
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I assume that your sequence diagram has two lifelines, one for the user and one for your system or a component thereof. You will then have messages between the lifelines representing the interaction between both parties. User input could then be modeled as a message from the user lifeline to the system lifeline.
Each Message can have arguments (an ordered list of ValueSpecifications) and a signature which can refer to either an Operation or a Signal. The arguments of the message should match (in order) with the parameters or attributes of the referred signature. See the UML spec for details on the highlighted technical terms.
In your example, there could be a "login" operation with parameters "username" and "password". In the sequence diagram you could then have a message with messageSort = synchCall, its signature referring to the "login" operation and its arguments a list of value specifications like e.g. [LiteralString("johndoe"), LiteralString("TopSecret123")].
hielsnoppe
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