(Interactive System Productivity Facility) is a tool set for the IBM z/OS
) operating system
for mainframe computers. It includes a screen editor
, the user interface of which was emulated by some microcomputer editors sold commercially in the late 1980s
It primarily provides a IBM 3270 terminal interface with dialogs to run tools on the system under TSO. ISPF is frequently used to manipulate z/OS data sets via its PDF (Product Development Facility).