This book is brilliant. It's created by a co-op whit quite some level of expertise. It's suitable for every type and size of group and explains things from the basics over theory through practice to potential problems. This makes the book to a very useful tool for groups willing to self organize. Also the quality of the book is great; not just the information has a good level of information without being to boring but it has also a very consistent set of illustrations. Sometimes they are a little to much scaled up (which makes you see pixles) but I can live with that flaw.