Manuscripts typically preserve books of the New Testament in four groups: the Four Gospels; Acts and the Catholic Epistles; the Pauline Epistles traditionally including Hebrews; and the Apocalypse. Though few manuscripts contain all of these, the order with Acts and the Catholic Epistles preceding the Pauline corpus predominates and is therefore reflected in this edition.
Preface to The Greek New Testament (Produced at Tyndale House Cambridge)