The 12th WAMS concentrates on Applications of Simulation and Computer Technologies. Indeed the new 12th edition in 2019 will result another great opportunity for the International Simulation Community to meet together in the beautiful framework of Singapore, the City of Future, one of most popular destinations in Far East. In facts, WAMS is a workshop very effective in networking and very useful to set up new proposals and projects. Worldwide specialists have the opportunity to participate and to interact within this important International Forum on Applied M&S.