The Software Engineering Institute (SEI) of Carnegie Mellon University has appraised Invensys Rail Corp. at a Capability Maturity Model Integration (CMMI) Level 2 for work the company is performing for the Port Authority Trans-Hudson (PATH) transit system. CMMI Level 2 is an internationally recognized assessment process developed by SEI that provides a framework of best practices to guide an organization to improve quality, system engineering and project management through the use of reliable and repeatable processes. Invensys Rail is part of a consortium with Siemens Mobility and D. A. Builders, LLC, to design and install a new train control system on the PATH rail transit network.