Introduction:
Early language development is strongly influenced by children's health, nutrition, and caregiving environments. Children under two in low-resource settings are particularly vulnerable to developmental risks. Standardised tools such as the Bayley-4 Language Scale are widely used for professional assessment, yet they are typically developed for Western, monolingual populations and may not align with the linguistic and cultural realities of non-Western contexts. Adapting these measures is essential to ensure validity, equity, and cultural relevance within diverse health systems.
Purpose:
This presentation highlights the role of psychologists, and the collaboration between Indonesian and UK experts, in adapting the Bayley-4 Language Scale for bilingual children under two. It illustrates how psychological expertise contributed to both psychometric rigor and practical applicability within Indonesia's community health system.
Method:
Fieldwork in East Lombok integrated construct mapping, decentering and translation, caregiver response-process interviews, and psychometric validation. Indonesian psychologists led the psychometric analysis, ensuring construct validity and cultural alignment. UK psychologists, with expertise in early language development, provided developmental frameworks and supported the adaptation of English-based constructs to the Indonesian linguistic and caregiving context.
Results:
The adapted Bayley-4 Language Scale retained professional standards while achieving strong cultural and linguistic relevance. Although administered by trained professionals, the tool generated findings applicable to primary-level community health services, supporting early identification, developmental monitoring, and caregiver. This strengthened the relevance of professional assessment within locally embedded systems such as Integrated Health Service Post (Posyandu).
Conclusion:
This model demonstrates how psychologists can bridge clinical science with implementation in community health contexts. It offers a scalable, culturally responsive approach for LMICs seeking to embed valid early assessments into child health systems, promoting equitable developmental support during the critical first 1,000 days. This study was conducted as part of the UKRI-GCRF Action Against Stunting Hub (AASH), reflecting a cross-national effort to advance health equity and scientific collaboration.