  [Context and motivation] The automotive industry is currently undergoing a
fundamental transformation towards software defined vehicles. The automotive
market of the future demands a higher level of automation, electrification of
the power train, and individually configurable comfort functions.
[Question/problem] These demands pose a challenge to the automotive development
cycle, because they introduce complexity by larger and not yet well explored
design spaces that are difficult to manage. [Principal ideas/results] To cope
with these challenges, the main players along the value chain have an increased
interest in collaborating and aligning their development efforts along joint
roadmaps. Roadmap development can be viewed as a field of requirements
engineering with the goal to capture product aspects on an appropriate level of
abstraction to speed up investment decisions, reduce communication overhead and
parallelize development activities, while complying with competition laws.
[Contribution] In this paper, we present a refinement of the "Innovation
Modeling Grid" (IMoG), which encompasses a methodology, a process and a
proposed notation to support joint analysis of development roadmaps. IMoG is
focused on the automotive domain, yet there are clear potentials for other
applications.
