Domain-specific languages (DSLs) are frequently used in software engineering. In contrast to general-purpose languages, DSLs are designed for a special purpose in a particular domain. Due to volatile user requirements and new technologies DSLs, similar to the software systems they describe or produce, are subject to continuous evolution. This work explores existing research on DSL evolution to summarize, structure and analyze this area of research, and to identify trends and open issues. We conducted a systematic mapping study and identified 98 papers as potentially relevant for our study. By applying inclusion and exclusion criteria we selected a set of 34 papers relevant for DSL evolution. We classified and analyzed these papers to create a map of the research field. We conclude that DSL evolution is a topic of increasing relevancy. However, research on language evolution so far did not focus much on the characteristics DSLs exhibit. Also, there are not many cross-references between our primary studies meaning researchers are often not aware of potentially useful work. Our study results help researchers and practitioners working on DSL-based approaches to get an overview of existing research on DSL evolution and open challenges.

The behavior of systems of systems (SoS) emerges only fully during operation and is hard to predict. SoS thus need to be monitored at runtime to detect deviations from important requirements. However, existing approaches for checking runtime behavior and performance characteristics are limited with respect to the kinds of checks and the types of technologies supported, which impedes their use in industrial SoS. In this tool demonstration paper we describe the ReMinds tool suite for runtime monitoring of SoS developed in response to industrial monitoring scenarios. ReMinds provides comprehensive tool support for instrumenting systems, extracting events and data at runtime, defining constraints to check expected behavior and properties, and visualizing constraint violations to facilitate diagnosis.