To help you maintain different levels or versions of a library member, ISPF includes the Software Configuration and Library Manager (SCLM). SCLM is a tool that helps you develop complex software applications. Throughout the development cycle, SCLM automatically controls, maintains, and tracks all of the software components of the application. And you can lock the version being edited in a private library and then promote it. See z/OS ISPF Software Configuration and Library Manager Guide and Reference for more information.