A system and method for allowing external execution-time adaptation of application behavior of an application in a telecommunication system without modification to the application code comprises an application having at least one break point and residing on an application server, at least one identifiable decision engine, and a listing of break points that has for each break point at least one identifier of the decision engine, such that at one of the break points, the application accesses the listing of break points, invokes the listed instances of the decision engine corresponding to the break point, and adapts application behavior based on the decision engine. In addition, each entry in the listing of break points can have a sequence number so that if two entries for the same break point have equal sequence numbers, the decision engines identified in these entries can be invoked in parallel.