History of software testing

Below was brief history of Software testing, which was taught by my tutor. Hope it might help who ever looks for it:

1. In 1950's, testing was considered as debugging 
2. In 1960's, testing was considered as separate activity on debugging
3. In 1968, Software engineering was 1st used in NATO (North Atlantic Treaty Organisation) workshop at West German
4. In 1970, Software testing was treated as separate discipline