Editorial: AOP Systems, Software and Middleware

Aspect-oriented software development (AOSD) has grown into a well-established field within the software engineering community. AOSD is mainly concerned with developing and applying modularization techniques for the management of crosscutting concerns in large-scale applications. Though AOSD and, in particular, techniques for aspect-oriented programming (AOP) have been regularly introduced at the application level, their usefulness at the middleware and systems programming level is rapidly proving essential.