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ResumenEl objetivo de esta investigación fue evaluar las propiedades psicométricas de la escala de Felicidad Subjetiva (Lyubomirsky & Lepper, 1999). El objetivo del primer estudio, en que participaron 300 personas de población general, fue estimar confi abilidad (consistencia interna y estabilidad temporal) y validez de constructo de la escala. El segundo estudio, donde participaron 779 personas, tuvo por objetivo obtener indicadores defi nitivos de confi abilidad y validez en muestras con rangos etarios diversos. Además, evaluó validez convergente y divergente con los instrumentos: Inventario de Depresión de Beck (BDI), Cuestionario de los Cinco Grandes (BFI), y Cuestionario de Optimismo Disposicional (LOT-R). Los principales resultados del primer estudio muestran un alfa de .78 y estabilidad temporal de .61 (8 semanas de diferencias) y una estructura factorialmente pura. Para el segundo estudio la estimación de la confi abilidad estuvo entre .73 y .87 en las diversas muestra estudiadas; se encontró una estructura factorialmente pura; las correlaciones entre la escala de felicidad subjetiva y los instrumentos utilizados para evaluar validez convergente y divergente fueron adecuadas y altamente signifi cativas en la línea de lo esperado teóricamente. La evidencia indica adecuación de la escala para su utilización en la evaluación de este constructo en población chilena.Palabras clave: Psicología positiva, felicidad, análisis psicométrico. AbstractThe purpose of this study was to evaluate the psychometric properties of the subjective happiness scale (Lyubomirsky & Lepper, 1999). The objective of the fi rst study involving 300 people from the general population was the estimated reliability (internal consistency and temporal stability) and construct validity of the scale. The second study involved 779 people, its purpose was to obtain defi nitive indicators of reliability and validity in samples with diverse age range. In addition, convergent and divergent validity was evaluated with instruments: Beck Depression Inventory (BDI), Big Five Questionnaire (BFI), and Dispositional Optimism Questionnaire (LOT-R). The main results of study showed an alpha of .78 and temporal stability of 61 (8 weeks apart) and a pure factorial structure. For the second study, the reliability estimation was between .73 and .87 according to the many samples studied, was found a pure factorial structure, the correlations between subjective happiness scale and instruments used to assess convergent and divergent validity were adequate, highly signifi cant and in line with theoretical expectations. The evidence indicates adequacy of the scale for use in the assessment of this construct in the Chilean population.

Posttraumatic stress disorder (PTSD) is an anxiety disorder in which an individual re-experiences a traumatic event, avoids situations related to it, and shows excessive arousal. The disorder appears after experiencing a life-threatening event, such as a war or a natural disaster. Thus, the validation of tests which assess the disorder after the earthquake on February 27, 2010, in Chile is crucial for its evaluation and subsequent intervention. The present study includes psychometric data for the Posttraumatic Stress Disorder Checklist-Civilian version (PCL-C) on a sample of 509 survivors of the disaster. Values indicate good psychometric properties of the questionnaire.

It is commonly expected that collaborative work will lead to better results than working individually. It has been demonstrated by some that teamwork is more than adding together the product of individual work, though this may depend on various factors such as time, space, the tasks or activities nature, as well as team members' personalities. To date, little is known about the specific elements that contribute to this synergic effect; however, some have argued that emotions, in particular positive ones, may have a fundamental role in teamwork. In this paper we take a closer look at users' smiles -as a way of expressing happiness-by studying how they participate in the information search process of both individuals and teams. We present a user study involving 30 participants (10 pairs and 10 individuals) and show how smiling contributes to the overall experience of team members as well as their performance in an exploratory search task with respect to individual seekers. Our results indicate that smiling is significantly more prominent in participants working together synchronously than those working individually and that smiling may contribute to particular dimensions of information coverage.