SBLi gives the author of a scenario the option of specifying time and budgetary constraints for that scenario and associating time and monetary costs with actions performed in working through the scenario. As well as making users aware of these real-world concepts in the context of the scenario, including time and monetary costs also provides a means of evaluating the user's performance in completing a scenario: those completing a scenario successfully well within time and monetary budgets could be deemed to have performed well.