How do you know when a horse has had enough repetition and a skill is genuinely established?

Knowing when a skill has been sufficiently reinforced through repetition to be considered genuinely established is a judgment that develops through experience, but there are practical indicators a trainer can use to assess whether a behavior is ready to be built upon or still needs more foundation work. A skill can be considered reliably established when the horse produces the correct response consistently and willingly from a light cue, in multiple environments, across multiple sessions separated by rest, and after periods of time off without regression. Each of those conditions tests a different aspect of the learning — lightness tests the quality of the response, multiple environments test generalization, multiple sessions test consolidation, and time off tests durability. A behavior that meets all four conditions has been genuinely learned rather than recently acquired. A behavior that fails any of those conditions still needs more repetition in the appropriate context. The most common mistake is advancing to the next stage of training before the foundational skill is truly established, which is identified when the horse begins to struggle with the new request not because the new thing is too difficult but because the prerequisite skill was not solid enough to support it. When that happens, returning to repetition of the foundational skill — rather than pushing forward through the difficulty — is always the correct response. A training program built on skills that are genuinely established through correct repetition before each new layer is added produces horses that are confident, consistent, and capable of performing under pressure because every element of their training rests on a foundation that has been thoroughly confirmed.