We describe an approach to automate certain high-levelimplementation decisions in a pervasive application, allowingthem to be postponed until run time.??Our system enables a modelin which an application programmer can specify the behavior of anadaptive application as a set of open-ended decision points.??Weformalize decision points as Goals, each of which may besatisfied by a set of scripts called Techniques.??The set ofTechniques vying to satisfy any Goal is additive and may beextended at runtime without needing to modify or remove anyexisting Techniques.??Our system provides a framework in whichTechniques may compete and interoperate at runtime in order tomaintain an adaptive application.??Technique development may bedistributed and incremental, providing a path for thedecentralized evolution of applications.??Benchmarks show thatour system imposes reasonable overhead during application startupand adaptation.