We aim at synthesizing an executable specification for a real-time reactive system by integrating real-time scenarios into a reduced timed automaton (TA). A scenario is a part of the specification of a system behavior. The integration of scenarios into a single TA is based on its formal semantics. The TA, which results from the integration of a set of scenarios, is independent of the order in which the scenarios are added to. We also present an algorithm to reduce such resulting TA in order to prevent combinatorial explosion. q 2003 Elsevier B.V. All rights reserved