Consider the behavioral intervention to increase the active-play social interactions of a withdrawn pre-school child. (Johnson et al., 1965).
Towards the end, the researchers used this schedule of reinforcement:

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Intermittent reinforcement involves reinforcing the behavior only some of the time, rather than every time it occurs. This schedule has been shown to be most effective in maintaining behavior over time compared to continuous reinforcement, as the behavior is less likely to extinguish once the reinforcement is removed. DRO (differential reinforcement of other behavior) would involve reinforcing any behavior other than the withdrawn behavior, which may not be effective in increasing active-play social interactions. Extinction involves removing the reinforcement for a behavior, which would not be appropriate in this case as the goal is to increase the behavior, not decrease it.

Consider the Behavioral Intervention to Increase the Active-Play Social Interactions