Due to the growing complexity of software systems in modern automo- biles, the software architecture design phase becomes more and more important. Useful tools and languages are speci¯cally needed to man- age this complexity. Recently, the Architecture Analysis and Design Language (AADL) has been proposed as a modeling language for crit- ical systems and this language is becoming increasingly popular in the automobile industry. In order to test whether AADL is suitable for modeling software in automobile systems, we provide in this technical report a critical evaluation of the capabilities and features of this new language. Speci¯cally, we evaluate AADL against a set of requirements that have been identi¯ed based on an exhaustive literature review and experiences gained from modeling an Adaptive Cruise Control (ACC) in AADL. The objective of this paper is to evaluate the suitability of AADL and identify gaps that would require future research and devel- opment.