Feedback on my presentation

The two topics at in my presentation at the software architecture workshop that generated most questions (and discussions in the coffee break afterwards) were

1. The vertical versus horizontal development structure. This did not surprise me since I already knew that is an area of interest (see for example the article Software engineering for Automotive Systems: A Roadmap by A. Pretschner et al. in proceedings of ICSE 2007)
2. The handling of S/W variability, especially in an AUTOSAR context. This came as a surprise, and I certainly need to look into both what research and practical implementation have been done in this area. There has been some work on variability and AUTOSAR in the EAST-ADL2, but I am more interested in the technical implementation in the code than how to model variability.