Elanso

Hello World, I work for a business that develops devices that incorporate embedded software. In the past, these devices (no, I won't say what they are), have been pretty simple, but with increasing competition and customer expectations they are getting increasingly complex. What we used to do was put the "software" requirements into our system spec so that validation of that design would happen during system test, (which was not so unreasonable back in ye olde days of simple requirements). The problem is that the system engineers are now struggling with the complexity. What we want to do is redefine the process so that the system spec (and required system level testing) are framed in terms of lower level components, such that the system spec is smaller and more comprehensible. My question is whether there is a good software engineering book out there that deals with the system level questions, is comprehensible, and is NOT targetted at military/safety critical systems. We release a new product approximately every 6 months, so the process can't be too heavyweight. I have been searching Amazon, etc, but am swamped by the variety of texts, so some direction is very welcome. Thanks, P.