Brooke Foss Westcot was an English bishop, biblical scholar and theologian, serving as Bishop of Durham from 1890 until his death. He is perhaps most known for co-editing The New Testament in the Original Greek in 1881. He was an enthusiastic British imperialist.
I find this is _the_ method of textual criticism, biblical or otherwise. This will, no doubt, form your understanding of textual transmission history and the only true - I take the word with great responsibility - way of piecing together variant readings.
The classification system is profoundly important in a retroactive reading via Jacques-Alain Miller's structuralist "suture" in that the methodology employed by W&H is isomorphic with subjectivity as such in historic situations. A fantastic text!