Proceedings of International Structural Engineering and Construction, 8(1), 2021 Interdisciplinary Civil and Construction Engineering Projects Edited by El Baradei, S., Abodonya, A., Singh, A., and Yazdani, S. Copyright © 2021 ISEC Press ISSN: 2644-108X www.doi.org/10.14455/ISEC.2021.8(1).SUS-11 SUS-11-1 PARTICIPATORY PLANNING APPROACH TOWARDS SMART SUSTAINABLE CITY DEVELOPMENT PAWINEE IAMTRAKUL 1 , JIRAWAN KLAYLEE 1 , and ISOON RUENGRATANAUMPORN 2 1 Center for Excellence in Urban Mobility Research and Innovation, Faculty of Architecture and Planning, Thammasat University, Pathumthani Thailand 2 School of Transport Engineer, Suranaree University of Technology, Nakornratchasima, Thailand Cities have been witnessing a growing middle-class population and urbanization which has become challenges apart from development advantages. This huge paradigm shift of rapid development should meet the needs of current and future inhabitants without imposing negative impact on urban system among multi aspects of environment, social and economic dimensions, e.g., congestion, pollution, and poverty. To provide better living conditions, cities need to be improved by focusing on an alternative approach of development and sustainability aspect. This study adopted the principles of sustainable development to find ways to help innovate cities and find a mechanism to drive smart city development by creating participation among all stakeholders. The inclusion of public sector, private sector, local agencies is focused to search for an innovation development from 200 people in Pathumthani Province by using the design thinking process. The 3 dimension of design processes are: 1) define problems and give them a level of importance, 2) identify goals for smart city development and 3) recommend development plan for short term, medium term, and long-term planning by formulating projects on platform of technology and innovations. The study found that given the public and private sector's priority to creating city database with visualize system as a basis for city’s problem identification and lead to a sustainable solution. This will be a crucial step in the context of Thailand to find an appropriate way to a real successful smart city development. Keywords: Design thinking, Roadmap, Public participation, Smart city, Urbanization, Sustainable solution. 1 INTRODUCTION Urbanization pulls the cities to face the challenges of urgent global issues which comprises of geology, ecosystems, and climate change. However, it is a must to maintain the job opportunities, infrastructure and accommodation to support a better quality of life (QoL) of continued increasing in number of population (Iamtrakul and Klaylee 2018, Huovila et al. 2019). The digitalization innovation and technological development is important mechanism to create smart city solutions that can be an option on responding to a number of challenges that pose a risk to their sustainable development (Khan 2018). With the development of information communication technology (ICT), new technologies, participatory planning approaches must be integrated for smart city solutions. Cities possess driven innovative technologies database for