@InCollection{VogelSG11,
  AUTHOR = {Vogel, Thomas and Seibel, Andreas and Giese, Holger},
  TITLE = {{The Role of Models and Megamodels at Runtime}},
  YEAR = {2011},
  MONTH = {May},
  BOOKTITLE = {Models in Software Engineering, Workshops and Symposia
  at MODELS 2010, Oslo, Norway, October 3-8, 2010, Reports and Revised
  Selected Papers},
  VOLUME = {6627},
  PAGES = {224-238},
  EDITOR = {Dingel, Juergen and Solberg, Arnor},
  SERIES = {Lecture Notes in Computer Science (LNCS)},
  PUBLISHER = {Springer-Verlag},
  URL = {http://dx.doi.org/10.1007/978-3-642-21210-9_22},
  ABSTRACT = {In model-driven software development a multitude of
  interrelated models are used to systematically realize a software
  system. This results in a complex development process since the models
  and the relations between the models have to be managed. Similar
  problems appear when following a model-driven approach for managing
  software systems at runtime. A multitude of interrelated runtime models
  are employed simultaneously, and thus they have to be maintained at
  runtime. While for the development case megamodels have emerged to
  address the problem of managing models and relations, the problem is
  rather neglected for the case of runtime models by applying ad-hoc
  solutions. Therefore, we propose to utilize megamodel concepts for the
  case of multiple runtime models. Based on the current state of research,
  we present a categorization of runtime models and conceivable relations
  between them. The categorization describes the role of interrelated
  models at runtime and demonstrates that several approaches already
  employ multiple runtime models and relations. Then, we show how
  megamodel concepts help in organizing and utilizing runtime models and
  relations in a model-driven manner while supporting a high level of
  automation. Finally, the role of interrelated models and megamodels at
  runtime is discussed for self-adaptive software systems and exemplified
  by a case study.}
}