%R 10.1007/978-3-662-45234-9_11 %N 8802 %K Self-expression; coordination patterns; ensemble computing %D 2014 %S Lecture Notes in Computer Science %O 6th International Symposium, ISoLA 2014, Imperial, Corfu, Greece, October 8-11, 2014, Proceedings, Part I %T Self-expression and Dynamic Attribute-Based Ensembles in SCEL %P 147-163 %I Springer %X In the field of distributed autonomous computing the current trend is to develop cooperating computational entities enabled with enhanced self-* properties. The expression self-* indicates the possibility of a component inside an ensemble, i.e. a set of collaborative autonomic components, to self organize, heal (repair), optimize and configure with little or no human interaction. We focus on a self-* property called self-expression, defined as the ability to deploy run-time changes of the coordination pattern of the observed ensemble; the goal of the ensemble is to achieve adaptivity by meeting functional and non-functional requirements when specific tasks have to be completed. The purpose of this paper is to rigorously present the mechanisms involved whenever a change in the coordination pattern is needed, and the interactions that take place. To this aim, we use SCEL (Software Component Ensemble Language), a formal language for describing autonomic components and their interactions, featuring a highly dynamic and flexible way to form ensembles based on components? attributes. %B Leveraging Applications of Formal Methods, Verification and Validation. Technologies for Mastering Change %A Giacomo Cabri %A Nicola Capodieci %A Luca Cesari %A Rocco De Nicola %A Rosario Pugliese %A Francesco Tiezzi %A Franco Zambonelli %L eprints2940