1. ASTRA project website: http://www.astra-project.net/
2. Bellotti, V., Back, M., Edwards, W.K., Grinter, R.E., Henderson, A., Lopes, C.: Making Sense of Sensing Systems: Five Questions for Designers and Researchers. In: Proceedings of the Conference on Human Factors and Computing Systems, pp. 415–422 (2002)
3. Dey Anind, K.: End-User Programming: Empowering Individuals to Take Control of their Environments. In: Proceedings of the CHI 2005, workshop on the Future of User Interface Design Tools (2005)
4. Drossos, N., Goumopoulos, C., Kameas, A.: A Conceptual Model and the Supporting Middleware for Composing Ubiquitous Computing Applications. Journal of Ubiquitous Computing and Intelligence (JUCI), special issue on Ubiquitous Intelligence in Real Worlds 1, 1–13 (2007)
5. Hudson, S.: Leveraging 1,000 and 10,000-Fold Increases: Considering the Implications of Moore’s law on Future UI Tools Research. In: Proceedings of the CHI 2005, workshop on the Future of User Interface Design Tools (2005)