  This paper presents our work-in-progress study on reference architectures as
boundary objects for realizing trustworthy collaborative Cyber-Physical Systems
(CPS). Furthermore, the preliminary results from interviews with systems
engineering experts from industry and academia are also discussed. The
interview results reveal challenges in using reference architectures during the
system development process. Furthermore, exactly which trustworthiness
attributes (security, availability, reliability, etc.) should be addressed to
realize trustworthy collaborative CPS is identified as an open question, which
we will address in our future work.
