Active programs behave based on occurrence of events and therefore they facilitate capturing events and states. The active system is a rule-based system and we use event-condition-action rules to show active rules. Thus, defining active behavior is facilitated by event-condition-action rules. An active system, forming a runtime environment, sets a trap to catch runtime events and then check them by the rules. The rules appear in form of event-condition-action. Exploiting active programs as event based environments and using event-condition-action rules are main contributions of our approach. In this paper, we propose a new approach based on a bipartite framework exploiting capabilities of active systems. We apply our approach to a classical Abstract Data Type (ADT), stack, and express how one can use an active environment for observance tracking the stack.