Question

guys how can I make conditions in use case diagram ? Something like decision node in activity diagram.

For example, If there is “evaluate” usecase which can lead either to Y or N, there is simply no way to express it. There is only constrain feature, that would lead to repeating { if evaluated } {if evaluated } ……

Answer 1

What you probably want to use is alternative paths, basically what you do is you repeat part of your use case like this:

In step 5, if there is not enough money on the account

1. 5.a Show a message to the user
2. 5.b User press “Try a lesser amount” button
3. 5.c System goes to step 3