In collaboration with the National Institute of Statistics (NIS) of Cambodia, Vital Strategies and ESCAP organised a three-day hands-on training workshop in Phnom Penh from October 7-9, 2024, as part of the CRVS completeness assessment initiative. The workshop focused on using data from the 2024 Cambodia Intercensal Survey (CIPS) to assess the completeness of birth and death registrations at both national and sub-administrative levels. Participants were introduced to small area estimation (SAE) techniques, particularly the Elbow, Lanjouw and Lanjouw (ELL) method, to calculate registration completeness in areas with limited data. Remote mentoring will follow to support the finalisation of the assessment.