Ideal Use Case for Lambda Expressions Suppose that you are creating a social networking application. You want to create a feature that enables an administrator to perform any kind of action, such as sending a message, on members of the social networking application that satisfy certain criteria. The following table describes this use case in detail: Field Description Name Perform action on selected members Primary Actor Administrator Preconditions Administrator is logged in to the system. Postconditions Action is performed only on members that fit the specified criteria. Main Success Scenario Administrator specifies criteria of members on which to perform a certain action. Administrator specifies an action to perform on those selected members. Administrator selects the Submit button. The system finds all members that match the specified criteria. The system performs the specified action on all matching members. Extensions 1a. Administrator has an option to ...