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ISPF (Interactive System Productivity Facility) was introduced by IBM to provide a standardized, menu-driven interface for interacting with z/OS systems. It became the primary productivity environment for mainframe developers and operators, simplifying access to datasets, editors, utilities, and system commands.
ISPF remains widely used today as the default working environment for mainframe professionals. It is central to daily development, debugging, and operations workflows in industries such as banking, insurance, government, and large enterprises running IBM z systems.