Background: Most instruments that assess quality of life have been validated by means of the classical test theory (CTT). However, CTT limitations have resulted in the development of alternative models, such as the Rasch rating scale model (RSM). The main goal of this paper is testing and improving the psychometric properties of the INTEGRAL…

Five studies document the validity of a new 8-item scale designed to measure "positivity," defined as the tendency to view life and experiences with a positive outlook. In the first study (N = 372), the psychometric properties of Positivity Scale (P Scale) were examined in accordance with classical test theory using a large number of…

Items from two American instruments (Students' Evaluation of Educational Effectiveness, and the Endeavor instrument) designed to measure students' evaluations of teaching effectiveness were translated into Spanish and administered to a sample of Spanish university students. Most of the items were judged by the students to be appropriate; every…