- 1979- NISO established a standard committee .
- 1980- Council on Library Resources (CLR) development of Linked System Project (LSP)
- 1988- The protocol moved from the LSP to NISO.
- 1992 and 1995- Z39.50 Implementers’ Group (ZIG)created version 2 and version 3 .
- 1994-Z39.50 begin use as international standards
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