This important book is very well written... not only the most important handbook on modular representation theory for the working mathematician, but it also can be considered to be a very helpful introduction to this deep and useful area of modern algebra.
Zentrallblatt für Mathematik
...the first comprehensive treatment of the general theory of modular representations of finite groups... this book is a very important contribution.
Mathematical Reviews
...excellent and authoritative book.
Bulletin of the London Mathematical Society