What is the fine-grained topic of the following text: Besides the intrinsic complexity of envisioned systems, one must consider that in most instances they are devised to interact with the physical world, facing challenges that go from the “modeling” aspects of the phenomena they should deal with to simulation of the physical systems and to identification of optimal information collection and processing, from design and validation of hardware to design and testing of software, etc. Only return the topic.
Challenges in Designing Systems that Interact with the Physical World