Published in 2002, it is the "revised and expanded edition" of the 1988 Dictionary of Pentecostal and Charismatic Movements.
The original edition states the contributors to the volume come from both within and without the movement(s), and a "balanced overview" is attempted.
While it attempts to be comprehensive, it does admit some imbalances in coverage mainly due to the absence of complete scholarly data for some countries.
As of the first edition, Gary McGee is an associate professor of Church History at the Assemblies of God Theological Seminary also in Springfield; and Patrick Alexander is an editor in Republic, Missouri.
As of the second edition, Eduard van der Maas is a former editor of textbooks and reference works at Zondervan.