Before revision: There are two components to testability : Falsifiability or defeasibility, which means that counterexamples to the hypothesis are logically possible.The practical feasibility of observing a reproducible series of such counterexamples if they do exist .
After revision: There are two components to whether a hypothesis is testable : Falsifiability or defeasibility, which means that the hypothesis could potentially be contradicted by empirical evidence.The feasibility of conducting and reproducing experiments which could yield positive or negative results .