Samenvatting
This paper revises this concept (Verifiability) by requiring that the events actually be verified and it presents two new types of objectivity-subjectivity of life events, Item Selection and Event Quantification. Three issues pertaining to the design of life event studies are presented and it is shown that these design issues interact with Verifiability and Event Quantification, sometimes resulting In studies with serious threats to their validity. It in recommended that all three types of objectivity-subjectivity be considered when designing life event studies.