2019-07-252019-07-252019-02http://hdl.handle.net/123456789/11279engUrheberrechtlich geschützthttps://rightsstatements.org/page/InC/1.0/150On Measuring Some of the People Some of the Time with Some of the Items: The Search for Stability and Variation in Item SetsDissertationPersönlichkeitsentwicklungPsychologieMessungTesttheorie