In SE-Asia, coastal ecosystems provide many services to communities, including the provision of food, protection of storms and pollution, as well as recreational and tourism services. These coastal ecosystems, and the services they provide, are under threat across SE-Asia due to rapid population growth and development. Many socio-ecological problems have arisen as a result. Examples of these are fish catch decline, mangrove loss, water pollution and food insecurity. In this paper we describe work being undertaken in the Capturing Coral Reef and Related Ecosystem Services (CCRES) project, a Global Environment Facility, World Bank and University of Queensland funded project. This work is using systems thinking and system dynamics, along with community engagement, to understand why these socio-ecological problems occur and what can be done to address them. The project is only half complete, however our results to date show that systems thinking and systems dynamics are useful methods for addressing socio-ecological problems. Success depends on using appropriate tools and processes to engage the community and package models in ways that are accessible to most people. We have and are developing Apps and scripts for this purpose, for both data capture and for model delivery, which demystify systems thinking and systems dynamics and facilitate its use in socio-ecological problem solving.