For many of the interventions profiled, it is has been identified that the question of “how much is enough?” can make the difference between the success and failure of an intervention. According to Zarrit et al (2008), “in the caregiver literature we can find examples of studies that expected to produce far-reaching changes while providing fairly minimal exposure to treatment. Treatment will not be effective if not delivered at a high enough frequency or intensity to make a difference in the targeted stress processes.” While more systematic investigation into interventions is required, it has been shown that in both respite care (Zarit et al., 1998) and in multicomponent interventions (NYUCI), better outcomes are achieved when assistance is available in sufficient amounts and across time.

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