Re-Evaluating the Zarit Caregiver Burden Interview: Limitations of the Unitary Construct and the Promise of Network...

The Zarit Caregiver Burden Interview (ZBI), including its Japanese validation by Arai and colleagues in 1997, has become one of the most widely utilised instruments for measuring caregiver burden in dementia care and psychogeriatrics worldwide. While acknowledging the instrument's clinical utility in identifying at-risk caregivers and its historical role in legitimising caregiver experiences, this review examines the theoretical and practical limitations that have emerged from treating burden as a unitary construct amenable to simple quantification. Through the lens of network pluralism-a philosophical framework increasingly influential in psychiatry-we argue that the ZBI's psychometric reductionism has constrained our understanding of the complex, relational and emergent nature of caregiving experiences. This review critically examines three domains of concern: (1) the epistemological limitations of treating caregiver burden as a latent variable rather than an emergent network phenomenon, (2) the temporal coincidence between burden measurement instruments and healthcare policy transformations in contexts such as Japan's Long-Term Care Insurance system and (3) the cultural and ethical implications of imposing measurement frameworks across diverse caregiving contexts. While the ZBI has demonstrated predictive validity for caregiver health outcomes and has facilitated resource allocation, the instrument's widespread adoption has occurred without adequate consideration of its theoretical assumptions and potential unintended consequences. We propose that network pluralism offers a complementary framework that preserves the practical benefits of standardised assessment while incorporating contextual, relational and systemic dimensions of caregiving. Specific recommendations for integrating network approaches into clinical practice are provided, including multi-method assessment strategies that combine quantitative metrics with qualitative exploration of caregiver experiences, care relationships and support systems.