Now that we’ve covered the ZR-based metrics, let’s take a look at some of the other methods for evaluating defense out there. We’ll take a look at David Gassko’s Range, Clay Davenport’s Defensive Translations, Shane Jensen’s Spatial Aggregate Fielding Evaluations, and Tom Tango's Scouting Reports. Again, I’m including links to the original articles. I’m more or less summarizing it up for you.

David Gassko- Gassko is a regular contributor over at The Hardball Times. Back in 2005 he...