Index International Group Public Company Limited operates as an engineering consultancy company in Thailand. The company provides a range of services in specialized fields, such as preparation of master plans and project feasibility studies, topographic map survey, financial, economic and investment analysis and study, environmental impact prevention planning, calculation and detailed design in engineering and architecture, project management, and supervision of construction completion. Its services also comprise master planning in the fields of site reconnaissance and survey, socio-economic survey and analysis, and feasibility analysis; and complete design and engineering services for construction and contract bidding, such as preliminary engineering design, detailed engineering design, scale models when required, specification and drawings, bills of quantities, other technical description required for procurement and construction, and geographic information system. In addition, the company offers provision of construction inputs to architects-engineers through the design and engineering stages; construction management of turnkey, design, build and concessionaire projects; handling of contractual procedures necessary for phased construction; procurement services for materials and equipment, including the expediting of procurement, shop inspections, and shipping; schedule and quality control services; and value engineering services. Further, it offers project management/construction supervision and design–build services. The company was founded in 1983 and is based in Pathumthani, Thailand.