title: include & LogIn in UML use case
body: <p>I have an account based system,it means that every feature of the system can be used only after Log In.Also,as far as I know in use case diagrams we 'include' something in the base case if it is meaningless without the included action.Back to my problem,I have to draw the use case diagram of the system mentioned above and since every feature of the system can be used after login do I have to 'include' LogIn in every use case? </p>