Infrastructure Reference Model

Definition
Infrastructure Reference Model (IRM) version 1.0 is

"one of six reference models of the Federal Enterprise Architecture (FEA) version 2.0. It is a classification taxonomy used to describe the type of voice, data, video, cloud, and mobile host environments in a particular solution architecture at the system, segment, agency, sector, federal, national, or international level. The IRM can help to identify opportunities for collaboration, shared services, and solution reuse in agency IT portfolios and inter-agency Lines of Business."