Branching (If) in a sequence diagram

[cobra429]

Can anyone tell me how to model an if condition in a sequence diagram?  

I would assume that somehow EA would produce another object lifeline that would be conected to the original lifeline, but I can't seem to find how to go about this.

Thanks

[mikewhit]

The UML 2 way of doing this is to use an 'alt' frame around the condition.

There are also loop and opt frames for other purposes.

[Kevin Brennan]

Sequence diagrams should rarely include conditionals, as they should represent a single scenario. However, if for some reason you need to do this:

1. Select a Fragment from the Toolbox and set the Type to alt.

2. Enter the possible conditions in the Condition textbox and save them.