Ad Group ROI or Keyword ROI?

[Tonearm]

Do you guys track ROI per ad group or per keyword? Tracking per keyword would be theoretically ideal, but it sounds like it could get out of hand with too many "moving parts". Tracking per ad group sounds simple, but might not be granular enough.

What do you guys do?

[Rockgar]

The way I do it is track all keywords when things are new. Once I know which KWs convert I then switch off individual KW tracking and move to ad copy testing. It's probably not the best way but it works for me.