However, a growing number of financial and technical assistance resources are becoming available to aid South-East Asian countries in assessing the development of national PES strategies. Viet Nam, Indonesia and Indonesia's Aceh province are putting this assistance to use to both deploy individuals PES projects and in the development of policies and programmes. While there are several approaches to determining these values, each with its specific strengths and weakness, any approach should be based on local contexts. Where there is significant capacity with respect to valuation methodology, it is more difficult to find expertise with experience in its practical application for PES, thus the development of local expertise and capabilities is needed if PES is to succeed.