In operant conditioning, learning is facilitated if there is a clear and consistent relationship between a behavior and its consequences. This means that when a behavior is followed by a desirable consequence (reinforcement), the likelihood of that behavior being repeated in the future increases. On the other hand, if a behavior is followed by an undesirable consequence (punishment), the likelihood of that behavior being repeated decreases. Additionally, the timing and consistency of reinforcement or punishment also play a role in facilitating learning in operant conditioning.