1. Exploring investment opportunities of Thai MNEs in the Lao PDR in ecotourism sector. 2. Explaining determinants of Thai MNEs in the Lao PDR in ecotourism sector in three key tourism industries including tourist accommodations, tour operators and touristic sites develment. 3. Providing recommendations to related parties including public and/or private organization involved in supporting outward FDI from Thailand and inward FDI in the Lao PDR, expecially in tourism sector, and Thai MNEs already invested in or plan to invest in the Lao PDR in ecotourism related business.