Componentised Language Development for the JVM -- Preserving Confidentiality in Component Compositions -- Method Shells: Avoiding Conflicts on Destructive Class Extensions by Implicit Context Switches -- Separating Obligations of Subjects and Handlers for More Flexible Event Type Verification -- Implementing Feature Interactions with Generic Feature Modules -- Compositional Development of BPMN -- Building a Customizable Business-Process-as-a-Service Application with current State-of-Practice -- Verifying Data Independent Programs Using Game Semantics.  .

The book constitutes the refereed proceedings of the 12th International Conference on Software Composition, SC 2013, held in Budapest, Hungary, in June 2013, co-located with the STAF 2013 Federated Conferences. The 9 revised full papers were carefully reviewed and selected from 21 submissions for inclusion in the book. The papers reflect all current research in software composition, including but not limited to component-based software engineering; composition and adaption techniques; composition algebras, calculi, and type systems; feature-oriented software development; verification, validation, and testing; dynamic composition and reconfiguration.