This is a total small business set-aside solicitation for a firm-fixed-price purchase order to supply a brand-name Siemens Integrated Simulation and Digital Twin Platform (45 floating licenses), with a NAICS code of 541519 and a 150-employee size standard. Only small businesses that meet the size standard may submit a quotation, and the brand-name item is the only acceptable source due to compatibility with NIST's existing Altair software. The platform must enable seamless interaction between multiphysics simulation tools, system modeling environments, and data analytics frameworks under a unified licensing and deployment model. Performance and acceptance will take place at NIST's Gaithersburg, Maryland campus at 100 Bureau Drive. Quoters must have an active SAM.gov registration and include required representations and certifications with their quotation.