uml - Show condition in use case diagram -

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in system, user can have more 1 role. users 2 roles or more can switch between roles. however, it's impossible switch role user 1 role. how can represent fact in use case diagram?

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thank you.

you shouldn't show condition in use case diagram. use case diagram meant give helicopter view of features of application , hide details.

you can put condition in pre-condition of use case. if put user must have more 1 role pre-condition use case doesn't start if condition not true.

ps. i'm assuming role different concept roles represented actors , role have been account or group or else.


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