I am a web professional, with a background in writing. As the name implies, Van Dijck's book is geared toward those with a need to know the basic ideas and practices behind IA, without requiring a great depth of knowledge. It would be useful for copywriters, designers, project managers, account managers and others who work with or must dabble in information architecture. Exhaustive it's not - I read 75% of the book in about 3 readings. But that's just about what I was looking for and it lays a framework for diving deeper in areas of personal interest. Kind of like good IA, don't you think?