Mentor Graphics lends a hand to guide engineers who design electronic components. The company is a leading global developer of electronic design automation (EDA) software and systems used by engineers to design, simulate, and test electronic components, such as integrated circuits (IC's), wire harness systems, and printed circuit boards (PCBs). Products include PADS (PCB design), Nucleus (operating system), and Calibre (IC design). Its software is used to design components for such products as computers and wireless handsets. Clients come from the aerospace, IT, telecommunications, and, increasingly, transportation industries. Mentor Graphics agreed to be acquired by Siemens for $4.5 billion in 2016.