In Sabah, as in the rest of Malaysia, many indigenous languages are threatened by language shift to (Sabah) Malay. The present study examines to what extent Bonggi, an Austronesian language spoken on Banggi Island (Sabah State), is affected by these developments. One research objective was to investigate Bonggi language vitality, and explore local (church) interest in and priorities for Bonggi language-related efforts. To minimize the influence of outside researchers, the methodological approach was based on a participatory approach to language development planning. A second objective was to examine the usefulness and appropriateness of the chosen approach. Regarding the first research objective, the findings suggest that Bonggi language vitality is still vigorous in more remote parts of the island, while language vitality is weaker in the areas closer to the main town of the island. At the same time bilingualism in (Sabah) Malay appears to be pervasive throughout the Bonggi speech community. The findings also indicate that interest in Bonggi language work is rather limited. A few Bonggi church communities, however, expressed interest in creating Bonggi songs. Concerning the second research objective, the review of the methodology shows that the chosen approach is not appropriate in the context of research-driven sociolinguistic studies. ; National Foreign Language Resource Center