This badge earner can describe the role of mainframes and identify various operating systems that run on them (z/OS, z/VM, z/VSE, z/TPF, and Linux on z). They can explain how work is processed (batch, online), and the types of components that comprise a typical mainframe (processor, I/O, storage, security, network), and their importance. This individual can identify the differences between the EC12, BC12, and zBX hardware, and describe how the HMC is used to configure and control the mainframe.