The book's mandate is pretty broad, as the back of the cover blurb explains:
"Designing successful products and services in the digital age requires a multi-disciplinary team with expertise in interaction design, visual design, industrial design, and other disciplines. It also takes the ability to come up with the big ideas that make a desirable product or service, as well as the skill and perseverance to execute on the thousand small ideas that get your design into the hands of users. It requires expertise in project management, user research, and consensus-building."
It also has a large section devoted to qualitative customer research and using it to generate customer archetypes / personas for use in then designing for them.