59 Proactive Vitality Management and Creative Work Performance METHOD Procedure and Participants Data were collected in the Netherlands with the help of student-assistants who sent online questionnaires to working individuals in their network (i.e., network sampling; Demerouti & Rispens, 2014). This method allowed us to test our hypotheses in a heterogeneous sample consisting of individuals working in various types of professions and organizations in the Netherlands. In total, 242 individuals filled out a general survey measuring self-insight and social support for creativity. Subsequently, they participated in a three-week diary study that assessed their proactive vitality management and creative work performance on a weekly basis, yielding a total of 610 observations (i.e., an average of 2.5 observations per participant). The mean age of the participants was 35.67 (SD = 13.55), and 44.2% of the sample was male. Of all participants, 42.1% had completed higher vocational training and 27.4% held a university degree. As the present study concerns weekly assessments of work-related constructs, participants were required to work at least four days per week to be able to participate. Indeed, most participants worked full-time (according to Dutch standards; M = 37.71 hours per week, SD = 7.22) in a wide range of professions and sectors relatively representative for the Dutch population, including finances (15.3%), health care (12.4%), hotel and catering (10.0%), business (7.6%), education (7.2%), government (6.0%) trade and commerce (6.0%) and, to a lesser extent, in other sectors such as the creative industry and construction work. Of all participants, 50.9% had a permanent work contract (as opposed to a temporary contract) and 27.9% of the participants occupied a supervisory position. Person-Level Measures Self-insight was measured using the eight-item subscale of the Self-Reflection and Insight Scale (SRIS; Grant et al., 2002). Example items are “I usually know why I feel the way I do” and “I’m often aware that I’m having a feeling, but I often don’t quite know what it is” (reversed-scored) and were responded to on a six-point scale (1 = totally disagree, 6 = totally agree). Cronbach’s alpha was α = .78. Social support for creativity was assessed with three items based on the questionnaire developed by Madjar et al. (2002). For efficiency reasons, we decided to merge highly similar items of the original six-item scale. The resulting three items we used were 3
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