Back-Chaining : A teaching methodology, where the training of the chained behaviors occurs in reverse order. The final behavior is taught first, and the second-to-last behavior is added and taught next, and so forth.

For example: the very first behavior a back-chained "live find" dog is taught: is to play with new humans (the reward). For a Stay-and-Bark, the second behavior would be to "bark at a stranger" and then play. 

Behavior Chain : a series of learned behaviors, carried out, after one command. 

Blank Search : A training or certification exercise in which the target odor is not present  

Blind : A training exercise is considered Blind if the person person searching does not know the location of odor(s), and/or if any are prescent, BUT the accompanying Instructor/Evaluator DOES know.