Hans Vorster

Title	Authors	Topic	Symposium	Session
READERSHIP AND SURVEY NON-RESPONSE	Hans Vorster - John Smart	Response Rates	San Francisco - 1993	Session 6 - Survey and media effects
VISUAL AIDS AND QUESTION SEQUENCE - A 3X3 TEST	Hans Vorster	Questionnaire Design	Hong Kong - 1991	Session 3 - TECHNICAL ISSUES
COMPARING READERSHIP TECHNIQUES IN A SINGLE SOURCE DATA BASE	Hans Vorster	Readership Model	Salzburg - 1985	Session 2 - VALIDITY AND RELIABIILITY
ARE ALL THOSE CALL-BACKS REALLY NECESSARY?	Frankel Lester R - Hans Vorster	Response Rates	Salzburg - 1985	Session 4 - TECHNICAL ISSUES (PART 2)
Canada - the print measurement bureau	Hans Vorster	Survey Descriptions	New Orleans - 1981	Session 1 - Current Practices across the world

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