Diagnostic Engineering Consultants Limited (DECL), established in May 1991, is a leading Taiwanese geotechnical in-situ testing and monitoring company, specializing in geotechnical, structural, hydrological, groundwater, seismic monitoring and pile non-destructive testing used in projects such as dams, highway, tunnels, oil tank, bridge and deep excavation, etc.,

​With most of staff having over 10 to 30 years experience in this field, DECL has grown and is recognized as the most capable company in performing challenging projects in Taiwan. Besides the construction projects, DECL is also involved in research projects with research institutes, universities and related groups. Over the past years, DECL has developed long term relationship with some international institutes such as TNO (The Netherlands Applied Science Institute) and NGI (Norwegian Geotechnical Institute) to provide the technical service in Taiwan too.