Fundamentals:
Proofing is so that your dog can perform a behavior in a variety of environments. The goal is for the behavior to be reliably performed at varied distances, for longer periods of time, and with increased distraction. Difficulty can be considered another part of proofing, but is not as specific of a category (some look at overall proofing fundamentals as cumulative difficulty). Difficulty can be overall considerations for how difficult the behavior is to perform for a dog in a certain setting or on a certain day.
Below is an overview of cues that have been tagged as currently proofing. Take notes within each cue page to track proofing progress.