It's not a handbook per se. It's more as a sound liteture review on every aspect related to the subject (interoranizational relations). The depth of the academic review in all articles is truly remarkable. Worked just fine for my thesis as an introduction in an array of authors, texts and subjects! Further investigations always starts with a new look in its pages...
The only fault lies in the omission of some theoretical bodies of knowledge (the authors themselves admit it). This ought to be reviewed in a future edition. But it doesn't take the bright out of it, not at all!